546 



The Ohio Naturalist. 



[Vol. XV, No. 8, 



contained in the storage tissue of the rays estimated from plani- 

 meter measurements of projected drawings. In all cases Picea 

 showed little or no starch in its woody tissues, while Larix con- 

 tained starch in all of its corresponding living parts. The highest 

 relative amount of starch was found in the dwarf branches where 



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Fig. 3. Fig. 4. 



Fig. 3. Curve showing variation in .size of ray i)its of Larix occidentalis, 

 through one annual ring of IG tracheid.s, commencing with earliest formed 

 tracheid of spring wood and ending witli last formed traelieid of summer 

 wood. Vertical scale, diameters squared. 



Fig. 4. Curve showing variation in size of ray pits of Larix laricina, 

 through one annual ring of 11 tracheids, on same scale as Fig. 3. 



the rays were stored to their full capacity, but varying amounts 

 of starch were found in all other portions where the wood was 

 living. Rays of the sapwood zone, which was fifteen rings in 

 width in the lower portion of the trunk, contained starch through- 

 out the width of the zone. In some portions, 2% of the volume 

 of sapwood was starch, though the rays in this portion of the tree 



