461 



several rings a period in thc number of vessels and the 

 transverse diameters of vessels, fibre-tracheids and wood 

 parenchyma cells, in the 2 last named éléments especially 

 of thc radial diameter; the maximum of this period 

 about in the middle of the ring, the minimum in the 

 outer lovver than in the inner part, especially for the 

 radial diameter of the fibre-tracheids. The limits of the 



rings sometimes more dis- 

 tinct, by the number of 

 vessels in the différent 

 rings being unequal. On 

 the limits of the rings the 

 medullary rays mostly 

 somewhat broader. Vessels 

 for the rest regularly dis- 

 tributed ; almost ahvays 

 isolated, only very. seldom 

 in pairs. Fibre-tracheids con- 

 stituting the groundmass 

 of the wood; only now 

 and then in radial rovvs. 

 Wood parencMjma scarce, 

 scattered between the fibre- 

 tracheids; when bordering 

 on vessels, on the inner 

 side of thèse only. Medul- 

 lary rays in 2 kinds. The 

 in the middle sometimes 



iImM 



Fig2. 



Kurya acuniiata. Transvcr.^c sec- 

 tion. Zg Anniial rings; G Vessels; 

 Ft Fibro-lrachcids; P Wood paren- 

 chyma; Ms Medullary rays. 



most numerous generally 1- 

 2-seriate, 6 to 30, mostly 10 to 15 cells in height and 

 simple. The second kind 3- to 6-seriate, up to 150 cells 

 in height, often composite and consisting of3stories. The 

 absolute height of the first kind of medullary rays smaller 

 than that of the latter. Between 2 multiseriate medullary 

 rays mostly somo 1-seriate. The medullary rays laterally 



