1. The following result was obtained from the investigations of 90 stands of AKAMATU (Pinus densiflora S. et Z.) in Kinki district in Japan.
2. If D_h represents the mean diameter of head-spar-tree, N_h the number of trees of stand per acre, both just before thinning; D_s the mean diameter of the secondary stand, N_s the number of trees, both just after thinning; and D_h·s· the mean diameter of headspar and secondary stand, N_h·s· the number of stand; then the correlation between N_h/N_h·s· and D_h/D_h·s·, or N_h/N_h·s· and V_h/V_h·s· are highly accurate, and the relations between those may be expressed by the following formulas;
D_sD_hN_s/N_h/1.16870N_s/N_h-0.16870……(1)
logV_s/V_h=1.6958+0.3042N_s/N_h……(3)
log(log D_h/D_s)=-0.465427+1.25108log (log N_h/N_s)……(2)
log(log V_h/V_s)=-0.386325+0.812034log (log N_h/N_s)……(4)
It is statistically recognized that D_h or V_h has no influence on those relations.
3. Average diameter or stem volume of the secondary stand on one age-gradation of the yield table may be calculated by the following method;
A. Average diameter of secondstand.
a. Let the diffferences between the numbers of trees of one age-gradation and the front age-gradation be the numbers of the secondary stand.
b. Calculate N_h/N_h·s· first, and then calculate D_h·s: by the formula (1) or (2).
c. Dividing D_h by D_h/D_h·s·, obtain D_h·s·
d. Since D_h·s×N_h·s=D_h×N_h+D_s+N_s, obtain D_s from this expression.
B. Stem volume of secondary stand per acre.
a. Calculate N_h/h·s· same as for A, and next calculate V_h/V_h·s· by the formula (3) or (4).
b. Dividing V_h by V_h/V_h·i·, obtain V_h·s·
c. Since V_h·s·=V_h+V_s, obtain V_s from this expression.

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In a mixed plantation of Honjiro, Mineyamajiro, and Hozukijiro, (these three and Konentanijiro being comprised in the name of Shirosugi-race of Sugi), planted at Kitayama, Kyoto, I have compared each in its growth. The reason I have excepted Konentanijiro is that it is not usually grown in these days.
The age of stand is 12 years.
As the result of my researches, Honjiro and Mineyamajiro at this age have proved to be greater not only in diameter but in height also than Hozukijiro is. And it is found that there is no difference in diameter and height between Honjiro and Mineyamajiro.

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The study on the way in which the fibril is in the cell wall of a tracheid are arranged with respect to the morphological axis of a tracheid plays an important role in the structural investigation of a cell wall. An electron-microscopic method (by the replica) has been employed in this examination of the fine structure of a pitmembrane and the fibrillar orientation-especially near the borderd pit-in the secondary wall of conifer tracheids from HINOKI (Chainaecyparis obtusa) -and EZOMATSU (Picea jezoensis) wood. The 2-replica (the ethylmetaacrylate-Al, Cr-shadowed method by Tsuchikura and Akabori (1952)) was made on the surface of a piece of air-dried wood whittled by means of a plane or a microtome.
Results observed are as follotiws;
1) The pile direction of every two layers (for instance the outer and the central layer) in the secondary wall of a tracheid which has a different fibrillar orientation to the longitudinal cell axis, lies sometimes in the same direction, and sometimes in another direction (Fig. 1, 2). And the tertiary wall (so-called the particle structure (Fig. 3)) which appears on the inner surface contacting the lumen of a tracheid is found in a tracheid of HINOKI-, AKAMATSU (Pinus densiflora) -and SUGI (Cryptomeria japonica) wood, but not in that of EZOMATSU wood (Fig. 10).
2) In the past the radial structure of the pitmembrane of a borderd pit was observed by the optical microscope (Fig. 4), and the results were not sufficiently minute, but the electronmicrographs (Fig. 6, 7) show its structure radially-from the torus-fibrillar arrangement (the diameter of a fibrill is about 200-1000Å), and the distance of a so-called pit membrane pore between two radial f ibrills is presumed to be about 0.1-0.7μ in EZOMATSU tracheids.
3) The particle structure is also represented on the surface of the pit-border in contact with the pit chamber of HINOKI tracheids (Fig. 8).
In the outer layer (the pit-border) of the secondary wall of the borderd pit, the f fibril is have a circular orientation around the aperture of a pit (Fig. 6), and the f ibrills except that of pit-border generally orient at a certain direction, but they deflect as they approach the pit-border (Fig. 8). Though the fibrills orient at a relatively steep angle to the longitudinal cell axis in the central layer of the secondary wall, they deflect somewhat around the inner aperture of the borderd pit, and the long axis of the pit aperture is parallel to the fibrillar orientation (Fig. 5, 9). In the inner layer of the scondary wall the fibrills orient at a large angle to the longitudinal cell axis, and they deflect also around the inner aperture of the bodered pit (Fig. 10).
4) The long axis of the inner aperture of a bordered pit of a tracheid in contact with the ray parenchyma cell parallels to the fibrillar orientation of the central layer in the secondary wall as OHARA reported (1939) (Fig. 11).

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The author studied the fine structure of sulfite pulp by acid hydrolysis method, and the results were obtained as follows.
(1) The crystallin content of a long cellulosic fiber was higer value than that of short one.
(2) Owing to the bleaching actions, degradation of viscosity and D. P. of pulp was higher value than that of crystallized region of pulp.
(3) Crystallized region of pulp was more resistant than pulp itself against bleaching actions.
(4) When pulp was treated with 17.5% NaOH solution, viscosity of crystallized region decreased. It seems that cellulose became of alkali cellulose I.

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The antipulping effect of polyphenol in the acid sulphite cook was studied, and besides, the reaction of neutral sulphite pulping of the wood containing lignin previously combined with polyphenol was investigated. The polyphenol such as pinosylvin was substituted by phloroglucinol in this report.
Main results are as follows:
(1) Under the acidic condition, phloroglucinol combines with the lignin of wood in the proportion of about 126 to 900, namely, a mol to one of lignin-building unit.
(2) Also the wood in which lignin was combined with phloroglucinol can be sulphonated by the Kullgren-cooking process, and its s/Lig. ratio becomes over 3.5%. But its sulphonated lignin can not be removed by the acetic acid cooking.
(3) When the pre-sulphonated wood is phenolated by the phloroglucinol solution, its solid lignosulphonic acid combines with the phenol and becomes completely insoluble.
So, the reactive group of lignin which is also sulphonatable under the condition of high pH perhaps differs from the phenolatable group of lignin.
(4) The wood in which lignin was combined with phloroglucinol can not be delignif icated by the sulphite liquor with pH of about 6, but can be almost completely delignif icated by the solution of Na₂SO₃ (pH_??_9.8).
(5) When the phe.nolated wood is cooked under the alkalic condition, the phloroglucinol which has been combined with the lignin in wood can be removed, probably by breaking the link between lignin and phloroglucinol. This phenomenon gives a good reason for the experimental results in (4).

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