96 



THE BOTANICAL MAGAZINE. 



[Vol. XXXIV. Xo. 403. 



Table III. 



Radial curve of Crypiomeria 



(No. X) 



E- 



=vpx_ 



37 



P=7 



X 



r 



B 



d 



200 







0.42 



+ 0.42 



. 300 



.9.53 



8.73 



-0.80 



400 



15.19 



15.92 



+ 0.73 



500 



20.16 



22.16 



+ 2.00 



600 



25:75 



27.81 



+ 2.06 



700 



32.54 



33.00 



+ 0.46 



800 



38.35 



37.83 



-0.52 



900 



43.09 



42.37 



-0.72 



1000 



46.96 



46.76 



-0.20 



1100 



50.69 



50.75 



; +0.06 



1200 



54.73 



54.65 



-0.08 



1300 



57.72 



58.39 



+ 0.67 



1400 



62.85 



61.90 



-0.95 



1500 



68.41 



65.47 



-2.94 



1600 



74.63 



68.83 



-5.80 



curve of this tree shows a very good 

 example of parabolic form (Table III. 

 Art. Jap., p. (155), Fig. 5 1 ). Another 

 sample of large disk (No. XI) shows 

 also a typical parabolic radial curve 

 (Art. Jap., p. (155), Table 6 2 , Fig. 

 4 3 ). 



II. Trees other than Cryptomevia 



Disks of Tsuga (No. XIII), Quercus 

 (No. XVI, XVII), etc. (No. XII-XIX) 

 were taken from the wild-growd trees. 

 In general, the type of growth is rather 

 simple (Art. Jap., p. (156), Fig. 6 4 ), 

 and the radial curves show the para- 

 bolic form (Art. Jap., p. (157), Table 



n Fig. 7^. 



Huntington 7 made an extensive 

 measurements of thickness of annual 

 rings in American Sequoia washing- 

 toniana, and determined the type of 

 growth of 3250 years. In making use 

 of the data of his valuable measure- 

 ments, we see that the radial curve 



of this Sequoi follows a parabolic type (Table IV). 



B. Change of radial growth in different heights 



Three samples from Kiyosumi (No. I, II, III) consist of disks 

 taken at intervals of 2 m. from the base to the top of the tree. All 

 the radial curves in every disk are of parabolic type. Now, we will 

 consider the change of thickness of rings in different heights of the 



1. Graphical illustration of Table III. 



2. A, No. X ; B, No. XI. 



3. Graphical illustration of Table 6, B. 



4. Growth curves of various trees, taken in the same way with Fig: 1. A, No. 

 XIII; B, No. XV; C, No. XVI; D, No. XVII. 



5. A, No. XV; B. No. XII. 



6. Graphical illustration of Table 7, B. 



7. Huxtixgton, E., Douglass, A. E., etc. (1914) The climatic factor.— Carnegie 

 Inst. publ. No. 192. 



