Treating the seedlings of the Todo fir, Ezo spruce and the Akaezo spruce for an experimental material in order to find the difference, I compared the seasonal change of the winter buds and height growth of the seedlings with that of the cell sap concentration of the root tips and obtained the following result:
1. The osmotic pressure of the cell sap concentration reveals the highest curve during its dormant period showing above 20 arm press., and curves down the lowest during the growth period showing below 10 atm press.
2. The osmotic pressure at the time when the cell division begins is quite same as at the time when the cell division stops and the osmotic pressure at the both times is 15-16 atm press.
3. Observing the curve of osmotic pressure at the transition period in the late autumn and early spring, it is found that at the beginning of cell division the former rises up gradually during the first halif of the period, and falls down sharply in the last half, and the latter falls down gradually during the first half of the period and falls down sharply in the last half.
4. According to the report by Reed, H. S. in the Journal of agricultural research Vol. 21, 1921 it is reported that the osmotic pressure of the cell sap concentration rises up after its height growth ceases.
But my expriment shows that the osmotic pressure of the cell sap concentration does not rises up at all after its growth ceases. Reference:
Korstian, C. F., Density of cell sap in relation to environmental conditions in the Wasatch Mountain of Utah. Jour. of Agr. Res Vol. XXVIII, No. 8, 1024.
Reed, H. S., Growth and rapid growth, Jour. of Agr. Res. 21, 1921.
Walter, H., Die Hydratur der Pflanze and Ihre physiologischökologische Bedeutung. Jena. 1931.

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On seed-bed, the germination percentage of the hibrid F2 between Hinoki and Sawara was below 0.301% and this Percentage is extremly smaller. Therefore its growth followed germination was generally bad being smaller than that of parent seedlings.
As the results of examination and observation of leaves and roots which are the dentifying aspect of seedings of these two species of tree, we fonnd that the number of seedIings was only 5 and all seedlings expressed the quality of Sawara and, in their external appearance, no quality separated was observed.

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Abstructs of the experimental procedure and the results.
(1) The rutting was performed in Showa 22 and the principal species adopted were Akamatsu, Kuromatsu, Teidamatsu and Daiomatsu.
(2) The purpose of this experiment is to cultivate the species which grows rapidly and resist the coming of pine bark beetles.
(3) The process of rutting. in which inland Akamatsu was adopted as a mother end foreign Teidamatsu and Daiomatsu as fathers was failed.
(4) Among some groups of rutting, that of Teidamatsu as a mother and Akamatsu as a father, corns and seeds were gained.
(5) In respect to the relative shape of these corns and seeds between Akamatsu and Teidamatsu, the quality of hibrid was intermidiate of their parents.
(6) The size, the relative shape and the weight of 1000 grains of the hibrid were middle of those of the parents.
(7) The size, and shape of wing of the hibrid were larger khan those of mother Teidamatsu.
(8) In respect to the growth of seeding on seed-bed, mother Teidamatsu was lagest, father Akamatsu smallest and the hibrid in the middle.
(9) The length of needles of hibrid was middle of that of its parents and the rate of the appearance of 3 leave was faster and that of 4 leave was slower.
(10) From the examination in March of this year, the Color of Akamatsu was deep purple green that of the hibrid deep green and that of Teidamatsu light green.
(11) From the structure of the section of leaves, especially resin ducts no difference was observed comparing with its mother.
(12) The color of new buds of mother Teidamatsu was light greenish brown or green, that of Akamatsu light greenish brown and that of the hibrid intermediate.

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1. The forest fires are inclined to occure on the warmfront. We must care for the. forest fire especially on the day when the temperature is high, the relative humidity is low and the wind velocity is fast.
2. When the wind velocity is about 10m/s, the velocity of the spreading of the forest fire is 3-4km/h, and the distance between the spot fires is often over 1 kilometer.
3. The fire runs up the mountain and runs down the opposite side, and the distance of the opposite side burned is effected by the topography. If the inclination is steep, the distance is short, but in case of smoothy, it is long.
4. The wilderness and the AKAMATSU forest are dangerous for the forest fire.
5. It is very difficult to extinguish the fire of the sung.

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This investigation was made for the purpose of figding out the seasonal variations in soil moisture due to various topographical posisions. The writer, to this end, laid down three plots in the forest of “Hiba” (Thujopsis dolabrata Sieb. et Zucc.) on the Tsugaru Peninsula, Plot A (ridge), B (middle slope) and C (lower slope), took samples from each horizon of these plots and measured their moisture content. (See the paper in Japanese)
Supposing edaphic factor was constant, the amount of soil moisture would be influenced chiefly by climatic factor and that above all by precipitation and evaporation which are respectively producer and consumer of moisture content in soil. Therefore, he calculated the correlattion coefficients of precipitation and evaporation to moisture content and compared the degree of this correlation. (See ditto.)
Though the results did not show too high correlations, he found certain correlations (20% point), with amount of precipitation at H layer in plot B and at B₁ and C₂ horizons in C, and with evaporation at B_l and B₂ in A, and at A₁ and B₁, in C.
These results indicate that the plot A has little relation with precipitation as it's surface has become hydrophobic, in plot C, the lower layer is nearly saturated with water and below B₁ horizon it is correlated negatively with precipitation as there is a stream of soil water between A₂ and B₁ horizons and besides C horizon is impermeable, and in plot B, moisture absorptive power is fairy high and the effect of climatic factors upon soil decrease tradually from surface to lower layer.
It is natural that the nearer to the surface, the more powerful should be the effect of atmospheric phenomena upon soil, and that moisture content to rainfall should be correlated positively. But as the case stands now in the lower layers of plot B and those below B₁, of plot C the matters proved to be in negative correlations, which is considered to be due to the fact that those layers are influenced deeply not only by percolating water but also by free soil water, because they lie on the middle or lower part of the slope. Thus, the lower it lies on the slope, the upper in each profile appears the negative correlate position.

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1. The cork-bark of “Abemaki” (Quercus variabilis) was analyzed with the usual method employed for the analysis of wood.
2. Suberin was determined with the method proposed by Zetzsche.
3. Due to the presence of suberin in cork, the Cross-Bevan method and the 72% sulphuric acie method gave the unproperly high value at the determination of cellulose and lignin, respectively.
4. For the determination of cellulose of cork, the method, at which the sample is treated alcoholic-nitric acid solution and then treated with alcoholic-potassium hydroxide solution, may be applicable.
5. The extraneous components of cork were divided into groups of chemically similar substances. Yield and some properties of the each fraction were examined.

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Among the dimensions of finished band saw blabe, height of tooth H, size of set b and pitch t were measured about all teeth (200_??_500) on one blade, and the precision of finishing was investigated.
The results are indicated on Table 1, and as follows:
1) The irregularity of height of tooth H is specially large in comparison with the one of other dimensions.
2) As the standard of decision about the irregularity of H, the theoretical cutting depth δ₀ is to be taken.
3) The irregularity of pitch t is neglisible.
4) Cutting area of a tooth may be five or six times greater than the theoretical on. Thus co large safty factor is to be considered in respect to discharge of saw dust and strength of tooth.
5) Or, woods are not able to be sawn at the decided speed, and so the efficiency comes down.
6) The irregularity of b and H influence upon the evenness of sawn woods and deteriorate the quality of woods.

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The autheor studied on the physical and mechanical properties of five typical softwoods (Abies holophylla Max., Abies nephrolepis Max., Picea jesoensis Carr., Picea Koraiensis Nakai and Pinus Koraiensis S. & Z.), in the Eastern Manchuria.
The result of this experiment are given in table la and lb.
Table 1a. Physical properties.
Table 1b. Mechanical properties
The shrinkage-specific gravity ratio, the Quotient of quality., and the index of static quality ralative to the strength of woods are calculated, to estimate their quality.
Table 2 Shrinkage-specific gravity ratio.
Table 3 Quotient of quality.
Estimating the results in the tables 2, 3, and 4, it is recognized that Pins koraiensis is the best, Picea koraiensis and Abies holophylla are the better, Picea jesoensis is the medium, and Abies nephrolepis is the inferior in the quality of the wood.
In other words; the order of quality of wood is as follows: Pinus>Picea>Abies
Table 4 Index of static quality.

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