According to the results of more than 133 experiments so far done on the cathodo-luminograms of teeth, four types can be recognized, namely -1) a type in which both the corona dentis and the radix dentis show bright red luminescence, called a) type, 2) another type in which the former shows bright red luminescence but the latter gives luminescence belonging to blue tone, called b) type, 3) a special type, say a mixed type of a) and b) i. e. a part of the radix dentis belongs to a) type and another part belongs to b) type, called a) + b) type, and, 4) the fourth type in which the luminogram consists only of luminescence belonging to blue tone, the corona dentis, in this case, being lost by decay.
Of the 133 cases excluding the cases in which c) type occurred, a table showing the number of occurrence of each type of luminogram is given with respect to the positions of the teeth. When Pyorrhoea happened in alveolus, a) or a) + b) type very frequently occurred. The enamel of corona dentis always showed bright red luminescence.
The bright red luminescence shows the presence of traces of Bi in the calcium phosphate base of the teeth and the luminescence belonging to the blue tone indicates the presence of Zn or Cu or both in the same base.

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The author has the etiological studies of harelip and cleft palate, based on the examinations of 900 patients and their members of families which had belonged to 726 lineages, and 1627 women having the experience of a parturition, but no disposition of these malformation.
The results were summerized briefly as follows:
(Part I) studies on the clinico-statistical observation of harelip and cleft palate.
(1) About 16 of 726 cases showed distinctly thd hereditary nature.
The frequency of the consanguineous marriage of their proband's parents was 2.75 ± 0.60 % of all.
(2) These malformation were observed on males more than females. (male: female=2: 1)
(3) The complicated types were observed on males more than females, but in the simple types no difference could be observed between both sexes. The complicated types were a little more than the simple.
(4) The unilateral malformations were three times as many as the bilateral, and the left sided malformations were twice as many as the right sided.
(5) The 4.5 % of all cases had been complicated with the other malformations.
(6) Twin cases were observed on 0.8%(6 cases) in 726 lineages and this value is more than that of the inhabitant. There were 3 cases having these malformation among them.
(7) The families which have many children (above 5 brothers) were observed on the 25.6% of 766 cases. About 39% of 766 cases were observed on the first child of these brothers.
(8) The frequency of harelip and cleft plate among the inhabitant (at birth) was about 0.002.
(Part II) Studies on the intrinsic causative factor of harelip and cleft plate.
(1) The author used the most likelihood estimate (p) in place of the frequency of harelip and cleft plate among the brothers in the families having these disposition (p)
p=0.0287
The confidence interval for p of confidence coefficient 90 was
0.0225≤ p≤0.0364
This numerical value is far higher than the value of harelip and cleft palate among the inhabitant.
(2) Harelip and cleft palate have the hereditary nature and its formality of inheritance conforms to the theory of 3 recessive genes in which 1 lies in X-chromosome and 2 normal Chromosome.
(3) 5 types were distinguished among the malformed patients in the same lineage, namely type of brothers, type of parents and children, type of uncle (annt) and nephew (niece), type of cousins and type of cousin once removed. Most of each types were the standard-form.
(4) On so-called conductor, male cases were more than female.
(5) In cases of transmission from parents to children, the fathers affected more than the mothers, and further the inheritance to the same sex was more than to the other.
(6) It seems to the author that harelip and cleft palate have the nature of an antipitation.
(Part III) Studies on the extrinsic causative factors of harelip and cleft palate.
(1) Hyperemesis, disease and trauma among these extrinsic causative factors showed highly significant satistically between a group of these malformations and a group of normal children.
(2) About hyperemesis, a serious type (with malnutrition or brain-symptom) was observed on a group of these malformations more than on a normal group.
(3) About disease, there was no relation between these malformation and the spezific disease.
(4) As kinds of trauma, there were tumble, knocking and over-work in the early stage of a pregnancy.
(5) It is important that a pregnant women has been affected with the above mentioned factors by three months in the early stage of her pregnancy. The 27.5% of 606 cases was distinctly affected by these factors.

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Studies were made on the permeability of dental enamel using albumen and dyestuffs. The results were as follows.
1) It was proved by precipitation reaction that albumen, applicated to the surface of normal enamel of dog's canine, penetrated the enamel and reached the pulp.
2) At least 24 hours duration of the application of the albumen was necessary for its penetration to the pulp.
3) The penetration was not accelerated by addition of glucose to the albumen.
4) The antibody for the alumen was not proved in the serum of each individual dog by precipitation reaction.
5) Each of the dyestuffs (5 % eosin, 3 % fuchsin, 1.5 phenol-fuchsin, 4 % methylene blue, 5 neutral red), applicated to the surface of normal enamel of dog's canine, penetrated also the enamel, and within the above mentioned dyestuff eosin, phenol fuchsin and methylene blue reached the pulp.
6) At least 20 hours duration of the application of the dyestuffs was necessary for its penetration to the pulp.
7) The direct relation was not found between the penetration of each dyestuff solution and its pH.
8) The penetration of the dyestuffs was easier in the region of the lingual fissure of enamel than other regions.

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Into the abdominal cavity of a healthy rabbit, about 2 kg. heavy, I infused the Autolysat of a cattle's dental pulp at the rate of 5 c.c./kg. from which are derived the following conclusions as to the vicissitudes of the blood-picture:
1) The number of erythrocytes and the amount of haemoglobin do not show a typical change, The numbers of both erythrocytes and leucocytes increase and decrease nearly in the like process, though that of erythrocytes is rather smaller in the extent of its alteration.
2) The number of leucocytes is the smallest in 2-5 hours after the infusion, thenceforth, rising gradually, reaches the highest in around 48 hours after the infusion; thereafter it falls again approaching the normal value, and is restored within 72 hours after the infusion.
3) Each type of leucocytes, as to the relative value as well as the absolute value, has the least lymphocytes with the increase of neutrophilcytes on the other hand, in 2-5 hours after the infusion. We see an infantile type appear, too, and the leftward locomotion of the nucleus is observable. Thereafter, the leucocytes-picture becomes gradually normal and restored to the state before the in around 48-72 hours after the infusion.

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The germicidal effect of ultra-violet ray lamp (wave length 2537 Å) was examined in the instrument cabinet provided with it (see Fig. 1 and 2) o The inside of the cabinet was covered by well polished alminium plates in order to let the rays sufficiently reflect. The experiments and the results were as follows.
1) Staphylococci and colibacilli were smeared on the agar plates and they were exposed direct to the rays in the cabinet for 3, 5, 7, 15 minutes respectively. And then the growth of the bactsria was examined after 24 hours cultivation at 37°C The growth of staphylococci was markedly and that of colibacilli perfectly restrained by 5 minutes application of the lamp.
2) The effect of the indirect application by the reflected rays was lower than that of the direct, but growth of the bacteria was markedly restrained by 15-20 minutes application.
3) The reamers, used for the treatment of infected root canals, were wiped out and exposed direct to the rays for 3, 5, 7, 10 and 15 minutes respectively, and then put into the test tubes of bouillon culture medium. After 24 hours cultivation at 37°C the tubes were examined for the presence of turbidity. The results showed that the tubes were kept clear by 5 minutes exposure.

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Blood sugar rate in the patients suffering from pyorrhoea alveolaris were measured before, during and after the treatments (removal of dental calculus, curettage of gingival pocket, gingivectomy, Neumann's operation). The results were as follows.
1) Blood sugar rate rised after the treatments, especially on the day following the surgical operations and returned to the former after 7-10 days.
2) The relation was not found between the change of the blood sugar rate and the blood pressure of each individual patient.

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Statistics regarding the frequency of the congenital absence of teeth, based on an examination of 2388 school children in the Department of Oral Diagnosis of ABCC at Hiroshima City in the year of 1951, is presented.
(1) So far as the congenital absence of deciduous teeth is concerned, only four cases (0.77 %) were found in 517 children of 5-and 6-years-old groups.
(2) The congenital absence of permanent teeth was discovered in 162 children (8.66 %) among 1871 children from the age of 14 to 19 years. Sixty-two percent had 1 tooth missing, 29 percent two teeth, 9 percent from 3-6 teeth missing. In all, 259 teeth were missing congenitally; the ratio of the upper and lower jaw was 6: 7, with no significant difference between the right and the left. They were equally distributed also in both sexes.
The frequencies of the congenital absence of individual teeth were as follows:
Maxillary:

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