The author measured the length and the radial diameter of tracheids in “Akamatsu” wood, and from these data calculated the length/diameter ratio of them. Five trees which grew in the natural forest in Kagawa Prefecture were selected for the material of investigation. In order to measure the size of tracheids two methods were emloyed:
(1) maceration method for the measurment in the length of tracheids (II) section method for it in the diameter of them.
The principal results are, in substance, as follows.
I. Not only in the length of tracheids but also in the diameter and legth/diameter ratio of tracheids, the variations of these data are considerably regular.
II. The variation in the diameter and the leggt/diameter ratio of tracheids are found to be in conformity with the variations in the length of them.
III. The tracheids of the stems are longer and wider in length and diameter than those of the branches, there is the same relation also between thick branches and slender ones.
IV. Rapidly growing trees are longer and wider in length and diameter' of tracheids than slowly growing ones, and the length/diameter ratio of tracheids in the former are larger than that in the latter.

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In my first study of this series, I found that the variation of the length-diameter and length-diameter ratio of trachids in “Akamatsu” wood are considerably regular. The chiefpurpose of the work reported here is to investigate that the analysis of the sample from various portions in a “Akamatsu” tree may show characteristic differences due to the portions in the chemical composition, and also to compare the chemical composition of a rapidly growing tree and that of a slowly growing one. Two trees (B1 and B2) out of five which had been used in my previous morphlogical study were chosen for the material in this work.
Main results are concluded as follows.
I. With a few exception, the variation of the chemical compositions which are due to the portions in a tree are slight, and chemical differences between rapidly growing tree and slowly one are also slight.
II. But in detail investigation, some regurations in the variations of the chemical composition are found.
III. There may be certain relations between the variations of the chemical compositi on and those of the size of tracheids.

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As a data to calculate previously the approximate inner tomperature of plywoods when they are manufacactured by hot press, I measured the temperature of midplane tm in timber plate placed between two electrically, at constant surface temperature t1, hoated steel plates.
The experiments wece done for the nextt three cases.
(1) Wood has no moisture
(2) Wood has moisture below fiber saturation point and heating temperature t1<100°C
(3) Wood has moisture below fiber saturation point and heating temperature t1>100°C,
For the former two the theoretical solution (1) cau be applied, so calculating α=λCR can get easily the value of tm, but for the last case I assumed the experimental formula (2) and determined the value of 1/αk by using of tm iobtained in experiment and contrived the method of calculation to know tm.

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According to Pillow and other botanists the spiral cracks exist in the tracheid wall of the green part of compression wood. Whereas the writer could not find any spiral cracks in green wood, but could find them after treating the material with alcohol, 72% sulphuric acid or copper oxide ammonia.
The writer's experiment reulted to the conclusion that lignin exists in quantity, forming spiral layer, in the, secondary layer of tracheid wall. So, it is the writer's opinon that-if the wood were treated to be dried or done to be changed by some other phisico-chemical treatments the spiral cracks come to appear in the secondary layer of tracheid wall.

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1 Introduction
The problem of the variation of fibrous cell size of coniferous and dicotyledonous wood has been studied by many writers, but no one has mentioned the relation between the tracheid length and the eccentric growth of the tree except late Prof. Kaneshi.
Prof. Kanéshi reported as follows. “The high degree of negative correlation exists between the tracheid length and the ring width. In the case of eccentricly grown tree, the tracheid length of the major radius is shorter than that of the minor radius.”2 Materials and Methods
Hiba (Thujopsis dolabrata) and Hinoki (Chamaecyparis obtusa) were employed for this investigation.
Hiba, Sample No. 1, were cut at 0.3 and 1.3 metres high above the ground; the former is marked section I, the later is marked section II.
Hinoki, Sample No. 2, were cut at 0.1, 0.3 and 1.3 metres high above the ground; these sections are marked section I, II and III.
Samples were taken in the small blocks of each section as Fig. 1.
Each block was cut as large as match-sticks and was put in the SCHULTZ'S maceration fluid.
3 Results
The tendency of the variation of tracheid length observed in the horizontal and vertical axis of the trees coincids with the formr theories, but there is no relation between the tracheid length and the ring width of the compression wood. (In the case of a normal wood, there is a high degree of negative correlation between the tracheid length and the ring width.)
The tracheid length in a eccentricly grown tree becomes longer in proportion to the ring width from the minimum radius to the medium radius along the annual ring; and then it becomes shorter and shorter until it comes to the maximum radius.
The tracheid length of minmum radius part is longer than that of maximum radius part in the care of medium heavy compression wood, but in the case of heavy compression wood, the relation between the tracheid length and ring width is contrary to the former case.

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The eguation of the locus of the knife ebge of rotary lathe is usualy considered as follow
γ=α(θ+C) [known as Archimedes Spiral.].
This is true when the knife edge moves exactry to the center.
But usualy the course of the knife edge is lower (or higher) than the horizontal center line a liltle [a].
So there is some difference between the curve which is usualy used and the real one.
The equation of the real curve traced by the knife edge, when the edge moves on the line which does not pass through the center, is follow
θ=√γ²-α²/ma-tan^-1√γ²-α²/a+C
a Distance between the course of knife edge and horizontal center line.
m Rate of the velocity of the knife edge.
c Constant, concerned fo the starting point.

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