When a dilute auric chloride solution is reduced by a saturated salicylic acid solution, thin crystals of gold can be obtained whose shapes are mainly triangle or hexagon and whose magnitude is about 8 microns in diameter. They have peculiar but systematic striped patterns on the surfaces. The electron micro-diffraction method was applied to these crystals, and by tracing the spots of the cross grating patterns under a three-stage electron microscope, the indices of the striped patterns were determined from the dark field image. The orientation of the zone axes in the crystal, and the direction of the warping as well as the radius of the curvature the crystal were also determined.

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The absorption spectra of aqueous solutions of following cobalt complexes were determined: [Co(phen)₃]Cl₃, [Co(phen)₃]Cl₂, Co(phen)₂Cl₂, Co(phen)Cl₂. Some correlations between the structures of the compounds and the absorption spectra were discussed. Absorption curves of trisphenanthroline complexes of Fe(II), Fe(III), Ni and Zn were also shown for the reference.

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Physico-chemical studies were made on the two fin whale milks preserved in an electric refrigerator 2-13 months after being collected and the following results were obtained:
The external appearance was of a viscous creamy state and the milk had a cod liver oil-like flavor. It was somewhat astrigent and the specific weight and boiling point were both lower than those of the human and cow milks. The surface tension and viscosity were higher than those of the human and cow milks. Due to fermentation it was acid and the acidity was high. The water content was lower than in the human and cow milks and the amount of solid substances were about 4 times that in the human and cow milks. The amount of protein was about 8 times that in the human milk and about 4 times that in the cow milk. The proportion of casein nitrogen and noncasein nitrogen was similar to that in the human milk. Of the whey proteins the amount of albumin was very small, the greater part being globulin. Amino acids found in 18 kinds of human and cow milks were found in these two milks. The amount of fat was 10 times that in the human and cow milks and the majority of the fat globules were large. The saponification, acid and iodine values were much higher than those in the human and cow milks. The high acid value was not the essential property of the milk. It was due probably to a part of the fat having been decomposed because of the milk being old.
The amount of lactose was 1/15-1/30 of that in the human and cow milks. This also was not the essential property of the milk. It is thought to be due to a part of the lactose decomposing by fermentation due to the milk being old. The amount of minerals was almost the same as that in the cow milk. Of the vitamins vitamin A and ascorbic acid could not be found but carotinoids, thiamine and riboflavin were found. Calories per 100gm were 320-350, being very much higher than the 65 calories for the human milk and 60 calories for the cow milk.

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With the Japanese materials consisting of 2, 709 families with 6, 360 children, the author examined the selective effect caused by the ABO incompatibility of mother and foetus. Attention was focused on the O×A and O×B matings. It was revealed that there actually exists a considerably strong selection and a shortage of children of certain groups from the incompatible matings. As the cause of such elimination of children two different ways of selection could be suggested; the one is at the time of fertilization and the other is by the incompatibility after fertilization. If the gene frequencies of blood groups in population would remain constant independently of each generation, it could also be surmised that mutations were occurring to compensate the losses of gene due to the selection.

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