In the primary report of this study, it was already pointed out that the phytopathogenic element of the “Witches' Broom” of the Paulownia could be a Virus-Protein owing to the success in the artificial infection of this disease by grafting method and to quite a similarity of the artificially infected plant to the naturally infected one in the Biuret-Trommer Reaction.
This paper deals with the further researches pn the reactions that the proteins in the disused plant show for the several sorts of chemicals. The results observed in the precipitation reactions of the proteins are as follows.
When the proteins included in every part of the plant were treated by KOH and CuSO₄ solution; the color-reaction, so-called the Biuret-Trommer Reaction, showed quite a contrastic difference between the healthy and diseased plant, that is, in the healthy plants the colourings lie towards red and in the diseased ones towards purple, with the exception of the root. The results obtained are shown in the following table.
In the observation on the influence of Kclo₃-solution upon the leaves of the diseased plants, the diseased leaves showed the remarkably injurious symptoms along their veins even in the 0.5% solution after 6 hours, whereas the healthy ones were slightly injured in the 1% solution after 12 hours.

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At the natural mixed forest of Shii (Shiia Makino) and Kashi (Cyclobalanopsis) in southern Kyushu, Japan, gradually Kashi is dominated by Shii and the stock iss decreasing by clear cutting and shortening of the maturity nowadays, for the increment of Kashi is slower than Shii.
Therefgre, the management for that forest must be planed to increase the stock of Kashi which is valuable as fire wood and timber.
For this purpose, considering the conditions of regeneration and growth, the maturity of Shii must be differed from that of Kashi. By this method, the maturity of the former is 15 to 20 years and the latter is 30 to 40 years, the stock of Kashi will be increase and then produce the superior fire wood and timber.

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Reexamination of SANIO's 1 st law was made on the wood-fiber of Yukunoki (Cladrastis ski kokiana MAKINO), Fujiki (Platyosprion platycarpum MAXIMOWIOZ), Inubuna (Fagus japonica MAXIMOWIOZ) and Buna (Fagus crenata BLUME). The results were shown in Figs. I, II, III and IV. From these results, some considerations were done on the factors causing such variation of fiber-length, and that the tension wrought on the cambium may be the limitting factor at least for certain period in the whole life of a tree is proposed.

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At the experimental forest of Tokyo University in Prefecture Chiba, authors carried out parallel experiments with green wood and seasoned wood, respectively 3 times uncontinuously, by the plant of dry distillation of wood in a semi-industrial scale.
According to the results when with the seaaoned wood, it was established that the shortening of the distilling time, higher yields of valuable products and concentration of pyroligneous acid were realized.
when using the green wood, if the drying of it was sufficiently executed for a long time. the yields of charcoal, tar and acetic acid were a little increased and hardness of charcoal was remarkably enhanced.

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Here are studied the problems about the locus of the knife edge of rotary lathe.
The centre of the spindle of rotary lathe is taken as the origin of rectangular coordi. nate (x, y) and polar coordinate (r, θ). The knife edge is to progress on the line (y=na) parallel to x axis. The angular velocity of rotation of spindle is w, the traveling velocity of knife edge is ν and ν/w=ma.
Then the results are as follows:
1) The general equation of the locus in polar form (r, θ) is
θ=Ro√r²-n²a²+sin^-1 na/r and the equation is also written as follow.
x=(R_o-maφ)cosφ-na sinφ y=(R_o-maφ) sinφ+na cosφ
φ is parameter and shown in Fig. 3.
2) The above equation is approximately written
θ=R_o-r/ma+na/r(1+n/2m)
or
r=(R_o-maθ)+n(2m+n)/2 a₂/R_o-maθ
when na/r is small
In actual case na/r is so small that the approximate equation is sufficient.
3) The cutting velccity u is not exactly proportional to radius r and approximately shown as follow.
u=w&sdotr(1-1/2m₂₂/r₂)
4) To hold the cutting angle constant, it is sufficient when the relation m=-n
is satisfied. 5) Then the thickness of produced veneer is 2π ma.

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The yields and qualities of the sulphate pulp as changed by the composition of digesting liquor, maximum cooking temperature, time of digestion are studied.
Maine results are as follows.
1) For obtaining of the highest yield of pulp, the digestion for 2 hours at 170°C gives easy bleachable pulp, and digestion for 1 hour at 170°C and 2 hours at 160°C give hard unbleachable pulp.
2) For fast removal of lignin and less destruction of cellulose, the method of sulphate digestion is superior to the soda digestion.
3) If the ratio of Na²S in the digesting liquor is high the content of lignin in the pulp decreases.

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