1. Cuttings of Broussonetia Kazinoki S_IEB. were treated with alternating electrical current (100 volt). The treatment stimulated the opening of buds of the cuttings.
2. The stimulating effect was highest in those treated for 30 seconds and for 5 minutes.
3. The less the diameter of the cuttings, the sooner the effect of the stimulation appeared.

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(1) The writers designed and carried out experiments on shelter-wood system under the so called “Randomized Block System”, in the Buna (Fagus Crenata B_LUME) forest within the jurisdiction of KUROSAWAZIRI District Forestry Office, IWATE Pref. That is, 12 plots were established under the method of 3 blocks-4 plots system. (see Fig.) The experiment is of 4 kinds based on ratio of broken canopy area to plot area, namely 0%, 30%, 60%, and 80%.
(2) On the stand structure before cutting, we made the statistical analysis whether the differeces between these blocks and plots are essential, that is, whether these samples are from the same population.
(3) We tested the distribution by D. B. H., tree volume and area shaded by crowns, after the following three methods: (I) A. Wald's and J. Wolfowitz's, (II) W. J. Dixon's and (III) K. Pearson's method.
(4) Then four factors sum of D. B. H., average tree height, total volume and total area shaded by crowns between randomly arranged plots were tested by “Analysis of Variance”, refering to the computed results of those between blocks.
(5) As shown in the tables above, essential differences could be recognized neither between blocks nor between plots, consequently we concluded that the sample might safely be said to belong to fhe same population.
(6) In brief, as a result of these tests, we found the ground for probability of the supposition that if after any natural regeneration or others, there occur differece between plots, it is due to the influence of cutting treament.

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1) We propose to name the glucoside, C₂₆H₃₂O₁₁.6H₂O (m. p. 171-171. 5), and its aglucone, C₂₀H₂₂O₆.2H₂O (m. p. 142-141. 5), symplocosin and symplocosigenol respectively from the name of its original plant.
2) From symplocosigenol and its methyl derivatives such various compounds were prepared in each crystalline states as following alkyl, acyl, nitro, and bromo-dertvatives;
Dimethyl-symplocosigenol C₁₈H₁₄O₂(OCH₃)₄ m. p. 128-128.5 needles
Monomethyl-monoethyl-sym. C₁₈H₁₄O₂(OCH₃)₃(OC₂H₅) _??_ 124-124, 5 prisms
Diethy-sym. C₁₈H₁₄O₂(OCH₃)₂(OC₂H₅)₂ _??_ 118.5-119.5 needles
Diacetyl-sym. C₁₈H₁₄O₂(OCH₃)₂(OOOCH₃)₂ _??_ 148-150 plates
Dipotassium-sym. C₁₈H₁₄O₂(OCH₃)₂(OK)₂ _??_ 210(decomp.) needles
Dinitro-dmethyl-sy_??_. C₁₈H₁₂O₂(OCH₃)₄(NO₂)₂ _??_ 162-163.5 warty-needles
Dibromo-dimethy-sym. C₁₈H₁₂O₂(OCH₃)₄Br₂ _??_ 171-172.0 needles
3) We concluded that symplocosigenol has two methoxyl, two phenolic hydroxyl groups and none other active groups in its molecule. The fact that it gives brown resinous agulcone on the hydrolysis with mineralic acid, accordingly, may be properly elucidated on such assumption that the agulcone would have anoxygen-heterocyclic ring in the funda-mental structure.

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1. An automatic switch for supplementary light in photoperiod experiments was devised.
2. Electrical circuits were closed or broken by means of metal and celluloid plate fixed on the dram of recording thermometer, which rotates once a day, and lighting and putting out at necessary time of supplementary light was made possible.

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