(1) One flavanone derivative, m. p. 265-266°C is obtained from the wood of Prunus serrata var. spontanea S. et Z. through the procedure of the lead-salt precipitation.
(2) This product is identified with known Eriodictyol (4′, 5, 5′, 7-tetrahydroxyflavanone) from the standpoint of its physical characteriatics and chemical properties.

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Shii and Tabu at the natural broad-leabed forests in Miyazaki have been used for the f firewood. Recent experiments show that they can be used as pulp-wood, and we studied the processes of felling, pruning, bucking barking and transportation for the pulp-wood and for the charcoal-wood respectively. Then the unit stumpage value was calculated. The result is that the price for the pulp-wood is 214% higher than that of the charcoal-wood. Such utilization of Shii and Tabu is more profitable and will be of much use for the improvement of that natural forests.

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It is an important work method in the erosion control to prepare the channel, but none of the formulas of velocity of water current which has been known up to date are available for the plan of the steep open channel.
We, therefore, measured the velocities of water in many open channel made of concrete at various places of southern Kyushyu.
If we apply the Bernoulli's theorem between the upper and lower points of the channel, then we have V²₂=V²₁+2gh-2gh′.
The value of h′ (friction head) calculated from the value of measurements is written h′ =K(V₁+V₂)²/4Rh, where R is hydraulic mean depth, then we have the value of coefficient K.
If we put K2g/4RK, then the velocity V₂ when the water current flowing in the velocity V₁ in a given point passed through the vertical height h of the steep open channel can be obtained by the formula V₂=√V²₁+2gh(1+K′h)-K′hV₁/1+K′h
The value of K′ obtained form the present measurement is not sufficient to draw the conclusion as shown in the preceeding table, and we intend to study it more critically in the near future.

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By a reaction of HClO₄ to native cellulose, hydroxyethyl cellulose and wood, we show as follows;
1). Mechanism for a reaction of HClO₄ to cellulose included in wood was much the same with it to native cellulose (cotton and pulp celluloses) and the limit concentration of HClO₄ between the intermicelliar and intramicelliar reaction to cellulose was about 50%.
2). Percentage of the lignin residues that were isolated from the 75% HClO₄ treated wood powders by washing with the same concentration of HClO₄, was 96.15% of 66% H₂SO₄ lignin.

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A. On the asumption that the volume of cut logs can be shown practically by the following formula, experimental formulas were led from the research data of 292, logs of SUGI, all being 4 meters long but various diameters.
V=(a+bG₀+cG₁d_γ+eG₂+fG_n)
The reason of assuming the above formula are as follows:
1, Most of the cubing formulas of cut logs used in the past are the abbriviated forms of the above.
2, As suggestible by the disgrams of V, G₀, G₁, γ, G₂, G_n, volume (V) can be shown by the formula:
V=a+bG_i(G_i: G₀, G₁, γ, G₂, G_n)
B. Among the following experimental formlas including one section out of five, there is no significant difference for 1% leyel of significance.
V=+0.004604+3.845182G₁ S=0.035044
V=+0.000616+4.153769_γ S=0.031051
V=+0.003569+4.409815G₂ S=0.035937
C, Among the following experimental formulas including 2 sections out of 5, there is no significant difference fox 1% level of significance.
V=+0.000465+0.438407G₀+3.489420_γ
S=0.01867
V=+0.003939+0.501401G₀+3.606105G₂
S=0.01883
V=-0.001393+1.959273G₁+2.185832G₂
S=0.01939
V=+0.003024+1.762613G₁+2.265029_γ
S=0.02147
D. Among the following experimental form ulas including 3 sections out of five, there is no significant difference for 1% level of significance.
V=+0.001744+0.4281G₀+1.7929_γ+1.8298G₂
S=0.0125
V=+0.000490+0.3468G₀+1.3167G₁+2.3593G₂
S=0.0130
V=+0.002420+0.4089G₀+2.5212_γ+1.1499G_n
S=0.0148
E. The experimental formula including all 5 sections is:
V=+0.000909+0.3487G₀+0.8054G₁+1.1935_γ+1.3360G₂+0.3619G_n S=0.010619
F. When the volumes accounted by Huber's formula Smalian's formula, Simony's formula. Shiffel's formula, and Wada's formula are compared with the volume by the experimental formulas including the same section or sections that the above various formulas have, there are significant difference for 1% or 5% level of significance, as follows:
Huber's f. V=γ×l S=0.0432
Exp. f. V=(+0.00015+1.038442_γ)×l S=0.0311
Smalian's f. V=(0.5G₀+0.5G_n)×l S=0.3356
Exp. f. V=(+0.002293+0.138398G₀+0.926559G_n)×l S=0.0373
Simony's f. V=(0.6667G₁+0.3333_γ+0.6667G₂)×l S=0.0310
Exp. f.V=(-0.004051+0.3784G₁+0.2840_γ+0.3729G₂)×l S=0.0176
Riecke's f. V=(0.1667G₀+0.6667_γ+0.1667G_n)×l S=0.0227
Wada's f. V=(0.074G₀+0.798_γ+0.136G_n×l S=0.0214
Exp. f. V=(+0.00605+0.1022G₀+0.6303_γ+0.2875G_n)×l S=0.0148
Siffel's f. V=(0.61G₁-0.23√G₁G₂-0.62G₂)×l S=0.0294
Exp. f. V=(-0.000435+0.2878G₁+0.5019 √G₁G₂+0.2412G₂)×l S=0.0162
G. For the above reason, it seems to be necessity to amend the coefficient of the cubing formulas used in the past to aply to the logs of SUGI, 4 meters long.

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