The protoplasmic streaming in the internodal cell of Nitella flexilis was found to be slightly accelerated by the addition of ATP in adequate concentrations. Thus, in the most remarkable case, 1×10^-3M ATP increased the rate of the streaming by 15% with a time-lag of 15 minutes. The accelerated rate was maintained for more than 50 minutes. With the removal of ATP, the rate went down within 10 minutes to the initial low level. AMP gave no discernible effect of acceleration on the rate of streaming in the cell.

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Metabolic activities of Proteus vulgaris with glucose as substrate, w ere investigated with special reference to the influences of the age of the culture. Changes in activities of fermentation (together with the respiratory quotient), consumption of glucose, and organic acid formation from glucose, as well as the extent o f inhibitionof glucose oxidation by various respiratory inhibitors were followed, using bacterial cells in a state of “resting cell” suspension harvested at various stages of growth.
The fermentative activity and the rate of glucose consumption were found to be subject to a steep rise at a period between 90 and 120 minutes of incubation of bacterial culture which corresponds to the logarithmic growth phase. Otherwise, no significant change was ever discovered.

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1. Structure of plastids was investigated using variegated plants of 41 species belonging to 22 families. For the study of plastid development, Agave americana var, variegata Nichols and a variegated form ofAllium fistulosum L. were employed. The results were summarized in Table 1 and Figs. 1 and 2.
2. Albicated plastids account for the structural abortion. The number of grana in albicated plastids is remarkably small in comparison with that of the normal green chloroplasts. Accordingly, albicated plastids are usually devoid of chlorophyll.
3. InAgave andAllium, the granum in albicated plastid ceased to multiply at an earlier stage of development.
4. Molisch's reaction is found to be positive in all albicated plastids as well as in normal green chloroplasts,
5. In some species of Liliaceae, albicated plastids and green chloroplasts were present admixed in a single cell.

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1) Existence of a growth hormone active to stipe elongation of Agaricus bisporus was proved.
2) Removal of gills from one side of stipe, insertion of mica plate between pileus-flesh and gills caused curvature of stipe, showing close relation between the stipe elongation and existence of gills.
3) Growth of fruit body is controlled by the growth hormone produced in gills and transported down to growth zone of stipe through pileus-flesh and partial veil. The transportation seems to occur much easier in the longitudinal direction than in the lateral directions in the stipe.
4) Growth of fruit bodies of Coprinus and other fungi seems to be also regulated by the same principle.
5) A bioassay method of the growth hormone of fungi using fruit bodies of commercial mushroom as the tester was proposed.

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1. The effect of water economy on the plant growth was investigated in young tobacco plants with water level lowering of culture solutions. The 2cm.-, 4cm.-, 6cm.- and 8cm.-sets were prepared.
2. The plant growth in dry weight was decreased in proportion to the water level lowering, i. e., the relative values of 100: 87.5: 78.9: 68.6 were observed at the 2cm.-, 4cm.-, 6cm.- and 8cm.-sets, respectively. Also the lowest net assimilation rate (NAR) was obtained at the 8cm.-set.
3. The ratio of the dry weight of non-photosynthetic organs to the leaf area indicated no difference among the sets.
4. With. lowering the water level, heavy water deficit was induced in leaves, but no deficit was observed in stems and roots. A clear relationship was discovered between the leaf water deficit and the ratio of submerged roots to leaf area (active root/leaf area ratio), which was used here as an indicator of the grade of water level lowering.
5. The net assimilation decreased almost linearly with progress of the leaf water deficit, while no change was observed in respiratory activity of leaves as to water deficit and no special depression of nitrogen content in leaves was detected during the experimental period.
6. The growth in dry weight at the 2cm.- and 8cm.-sets was calculated theoretically with the net assimilation, which was affected by the leaf water deficit caused by water level lowering. The agreement between the calculated and the observed proves that the primary cause of the growth depression with water level lowering is the suppressed photosynthesis of leaves.

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