H Doc 181 



Plate XXI 



n iHHP 



£. 



00 



-J- 



Clu 



772 2* 



r^> 



FiG-a 



mr-\ 



SZQsp 



Typical Cross Sections of Pinus palustris and echinata, and Radial Sections of Pinus palustris and glabra 



A Pinus echinata Cross section of two rings sp w sprmgwood su w summer wood ^„ , B , x1 .. ., ,, 



I Pinls paiustris Cross section of a very narrow ring Of the two medullary rays one is cut through a iow of paienchyma the other thiough 



CaMTpiNmoLAMA 8 Radial sections mr medullary rays tr tracheids of the medullary rays p parenchyma of the same, * p , simple pits 

 i^dmg fromTe fpar^Xma t^the ne^bormg Jacheids or common fibers c tr b p bordered pit The ray at Cis made up of tracheids 



only 

 S t Pisrus famjs^bis Radial section lettenng as in £> 



Originals magnified A, a $° the rest ^a illustrations .4 »$° the rest *$<> 



