102 



THE BOTANICAL MAGAZINE, 



[Vol. XXXIV. No. 403 . 





second law of Sanio, the length of tracheids of three trees was 

 measured. The result of measurements in one of them will be shown 

 in the table VII (H, height ; Y, number of annual rings counted from 

 outside). (Art. Jap., p. (170), Table 13 ; p. (171), Table 14) 



Table VII 



Length of tracheids of Cryptomeria (No. II) in different ages and heights. 





0.1 



3 



7 



11 



15 



19 



23 



27 







3.263 



3.538 



3.550 



3.500 



3.438 



3.475 



2.925 



2.063 



10 



3.250 



3.475 



3.488 



3.450 



3.438 



3.450 



2.800 



0.975 



20 



3.125 



3.388 



3.450 



3.463 



3.438 



3.363 



2.438 





30 



3.113 



3.325 



3.413 



3.400 



3.388 



3.250 



1.975 





40 



2.988 



3.250 



3.425 



3.313 



3.163 



2.650 







50 



2.863 



3.125 



3.213 



3.150 



3.038 



2.325 







60 



2.763 



3.050 



3.125 



3.088 



' 2.725 



1.275 







70 



2.563 ' 



2.925 



3.013 



2.775 



1.625 









80 



2.400 



2.513 



2.588 



1.913 











90 



2.013 



2.350 



1.050 













100 



1.438 

















From this table we see that in each definite height of the tree, 

 the length of tracheids increases with age, and that in each definite 

 year's growth, it shows its maximum value at the height of about 

 7 m. In other two samples of Cryptomeria, the same relations were 

 found as the result of Sanio's second law. (Art. Jap., p. (171), 

 Table 15 1 ) 



C. Radial diameter of tracheids in one and the same 

 annual ring in Cryptomeria japonica 



In the cross section of wood of Cryptomeria, the size and the 

 arrangement of tracheids are irregular, though there is a tendency of 

 radial arrangement. In one and the same annual ring, it is very 

 characteristic that their radial diameter gradually diminishes from 

 spring wood toward summer wood, but the maximum is not found 

 at the innermost cell of spring wood, but at some distance from the 



1. A, No. I: B, No. III. 



