The effect of population density on some characters of larva, pupa and adult in the rice stem borer, Chilo suppressalis, has been examined. The experiment was carried out under laboratory condition.
The results obtained are summarized as follows:
From these results, it is concluded that the crowded life may be favourable for larvae prior to the dispersion period, while after the dispersion period the relation is reversed.

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Nous avons remarqué en èvidence du cytochrome c dans l'intestin de la larve du Ver à soie (Bombyx mori L.) à l'aide du spectre d'absorption diffèrentielle qui est rèduite par l'addition de KCN ou l'ècubation seul.
L'intestin de la larve ont été homogénéisés avec de la solution de sulfate d'ammonium (saturation degré de 0.9∼1.0). Par l'addition de sulfate d'ammonium, le cytochrome c ont été précipité et on l'a purifié par l'adsorption et l'élution avec l'amberlite XE-64 (des résine échangeuses d'ions). Les extinctions relatives de la solution du cytochrome c de l'intestin sont presque les memes que celles pour le cytochrome c du papillon à l'onde de longeur 400∼650mμ.

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The nature of a blood coagulation acceleratorlike substance contained in brain, spleen, lever, kidney and lung in mice and the effects of warfarmn on this substance were investigated.
The estimation of the accelerating effects of the saline extracts of various tissues and of the saline suspensions of acetone powders of various tissues (tissue powder suspensions) on blood coagulation of normal and warfarin-treated plasma were based upon the observations on the differences between the coagulation time of a mixture, CaCl₂ + various tissue extracts or tissue powder suspensions+ test plasma, and the recalcification time or the prothrombin time of test plasma, or between the coagulation time of a mixture, CaCl₂+ brain thromboplastin + various tissue extracts or tissue powder suspensions + test plasma, and the prothrombin time of test plasma. Further, the effects of normal stored serum on the accelerating action by various tissue extracts and tissue powder suspensions of blood coagulation were estimated by the differences between the coagulation times of mixtures with and without various tissue extracts or tissue powder suspensions, the mixture being either warfarin plasma + CaCl₂, CaCl₂ + normal stored serum, or CaCl₂ + normal stored serum + brain thromboplastin.
The following results were obtained:
1. A blood coagulation accelerator-like substance is contained in various tissues, and it acts more strongly on the warfarin plasma than it does on the normal plasma. This substance is completely adsorbed by Ca₃(PO₄)₂ but incompletely by BaSO₄, and is somewhat unstable on incubation at 50∼56°C for 15min.
The substance in the tissue extracts accelerates the blood coagulation of warfarin plasma in the presence of brain thromboplastin or a mixture of normal stored serum + CaCl₂, but does not acclerate or rather inhibits the blood coagulation of warfarin plasma in the presence of a mixture of brain thromboplastin + normal stored serum + CaCl₂.
The substance in the tissue powder suspensions accelerates the blood coagulation of warfarin plasma in the presence of a mixture of brain thromboplastin + CaCl₂, but does not accelerate the blood coagulation of warfarin plasma in the presence of a mixture of normal stored serum + CaCl₂.
2. A blood coagulation accelerator-like substance in various tissues disappears completely by warfarin poisoning.

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1. The percentage of diseased moths of silkworms in a lot diminishes gradually as the date of eclosion retards.
2. Accordingly, its distribution does not show binomial distribution or POISSON distribution, in many cases.
3. The diseased moths of a lot, eclosed on the same day, show binomial distribution, regardless of the date of eclosion.
4. Such being the case, a lot is the population of assembly of worms, ranged with the diminishing percentage of pèbrine in accordance with deladed date of eclosion, holding the binomial distribution in each day.
5. For this reason, both, the sequential sampling inspection method devised by WALD and the method, ASTM Quality Control of Materials, cannot be used for the sampling inspection of mother moths of eggs, acid treated after chilled, and of eggs, hibernating.
6. The sampling of the silkworm mother moth must be the proportionate sampling.
7. In the case of common acid treated eggs, when all samples become free from pèbrine after daily sampling inspection, the whole eggs of a lot laid afterwards can be passed safely without inspection.

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[in Japanese]

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[in Japanese]

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The relations between the wing development of the corn aphid, Aphis maidis, and the change in the qualities of food leaves, Hordeum vulgare and Holcus Sorghum L. var. japonicus, due to growth or maturation and between the former and the wilting of the leaves were examined experimentally with special comparison to the aphid, Rhopalosiphum prunifoliae.
1. When the larvae of Aphis maidis are given yellow leaves just before harvest, they can hardly complete their full development.
2. When the food leaves are very young the winged forms are scarcely produced regardless of the concentration of food sap. However the rate of wing production becomes higher with the maturation of the plants.
3. The effect of the maturation of host leaves upon the wing development seems to differ with the species of host plants.
4. The concentration of food sap, however, is likely to have nothing to do with the wing development regardless of the species of the host plants.
5. When the larvae are overcrowded on withered leaves, the winged forms are more readily produced than when overcrowded on the normal ones.
6. The wing development in the next generation does not seem to be influenced not only by the sap concentration of leaves on which the adults feed but also by that on which the adults and their progenies themselves successively feed.
7. Aphis maidis is apparently more sensitive in the production of winges than Rhopalosiphum prunifoliae to the change in the qualities of food leaves.

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[in Japanese]

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