Metacercariae of sickle-heterophyes parasitic on the muscle of mullet taken from Oyodo River, Miyazaki Prefecture were collected through the artificial gastic juice digestion method and each groop of 100 metacercariae was given to every 10 chickens (120g150g in weight) and also to every 10 rats (55g72g in weight) through mouth. After that, one of each was dissected every 24 hours and observation was made on the parasitic site within the intestine, total number, infection rate, development of the body, and ovulation.
These are the results. The parasitic site is mainly below the middle part of the small intestine in both the hosts. The infection rate to metacercariae given to the hosts is 25.6% in chicken. 22.5% in rat. Ovulation begins on the sixth day in chicken, on the seventh day in rat. Development of trematodes in the hosts is almost the same in both the cases. Size of the body at the time when ten days have passed since infcetion is 0.825mm in length, 0.354mm in maximal width. Oral sucker, 0.057mm×0.051mm. Ventral sucker, 0.040mm×0.040mm. Penial sac, 0.125×0.035mm. Ovary, 0.068×0.067mm. Right testicle, 0.1000×0.095mm. Left testicle, 0.095×0.085mm. As for the movement of eggs in the uterus, the eggs appear in the ootype, then move leftwards, attain the part between the posterior end of the left intestine and the left testicle, and there turn around to proceed rightwards. Next attain the part between the posterior end of the right intestine and the right testicle via anterior edge of the ovary. With further growth of the body, the eggs, passing the anterior edge of the right testicle, descend through the middle part between the testicles, i.e., the excretory bladder, attain the posterior end of the body and there turn around, ascend, attain the anterior end of the penial sac via the interior of the ovary, or the exterior when the body has become adult. Then pass before the posterior end of the penial sac and lastly wander out from the ventral sucker. The posterior end of the uterus is connected with ejaculatory duct and the duct thus connected opens at the ventral. The size of egg is 0.0256mm×0.014mm. The egg has a small lid in the anterior, with sharp projection in its center. Eggs in different hosts are not different in size.

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The chemical analyses of seventy-eight samples of brine water in the Kujukuri gas field were carried out, and compared formationally and regionally.
At Mohara and Otaki districts, the ratios of I-/Cl- and Br-/Cl- are higher in the water of the lower Otadai and the Kiwada formations, than those of the overlying Umegase, and the underlying Ohara, Namihana and Katsuura formations. Regionally these ratios of the waters of the Kiwada formation decrease in the direction to the North. This fact reveals the coincidence with the tendency of thinning out of the formation to the same direction.
If we assume that dI -and dBr- are the enriched portion of I- and Br- in the brine water after the deposition of sediments, the ratio of dI-/dBr- remains nearly constant as 1.5_??_1.9 in this field. This fact suggests that the sources of I- and Br- are derived from the same materials, which may be the algae having high concentrations of the iodine and the bromine.
The high values of I-/Cl- and Br-/Cl-in the water of the muddy “Kiwada” formation compared to those of the sandy ones (“Umegase”, “Ohara”, etc.) also show that there were enrichment of the organic matters to the Kiwada formation at the time of deposition.

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For the purpose of obtaining performance data on zinc anode for use in cathodic protection of salt-manufacturing apparatus, laboratory works were carried out.
Anodic potentials and current efficiencies on zinc of various purity and some kinds of zinc alloys were determined in boiling brines at constant current densities ranging from 5 to 30mA/cm². The results and conclusions obtained are as follows:
(1) The tendency for zinc anode to become passive, which is liable to occur in sea-water at ordinary temperature or in fresh water at elevated temperatures, is not observed for zinc except for that of low purity.
(2) Both high-purity zinc and all zinc alloys keep for a long time an anodic potential of -1.0 volt (SCE) and exhibit such a high current efficiency of 90-99%.
(3) Zinc alloys tested show an anode performance of same level as compared with that of high-purity zinc. However, Zn-Al alloys have a tendency to become brittle in hot brine.
(4) In the case of a concentrated brine, in which some salts might deposit to zinc surfaces, the increase in anodic potential of zinc may occur at a lower current density such as 5mA/cm².
(5) For the cathodic protection of salt-manufacturing apparatus, high-purity zinc should be used at higher current densities more than 10mA/cm².

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