488 DR. P. GROOM AND MR. W. RUSHTON ON THE STRUCTURE 
representing the number of ray-tracheids, and the Arabie representing those 
of the thick-walled parenchyma): IH, 3, IV. 4, ПІ; another showed 1, 
3, III. — Ray-tracheids are evidently well-represented. Some uniseriate 
rays are composed solely of thin-walled parenchyma and ray-tracheids. A 
marked feature of these rays is the large size of the intercellular spaces. 
It was not possible to get perfect preparations of the fusiform rays, as 
these were all attacked by a fungus. The resin-duct was seen to be surrounded 
by thin-walled parenchyma, which extends for some distance towards the 
upper and lower margins, which were composed of ray-tracheids, or partly 
thick-walled parenchyma (fig. 40). 
D 
It is a pleasure to express our thanks to Sir David Prain, F.R.S., and to 
l 
Mr. R. 8. Pearson, Imperial Forest Economist, Dehra Dun, India, for their 
provision of the specimens used in this investigation. 
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