THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



YoL. XI. 



MARCH, 1890. 



No. 3. 



All commiinications for this Journal, whether relating to business or to editorial 

 matters, and all books, pamphlets, exchanges, etc., should be addressed to Ameri- 

 can Motithiy Microscopical Jourtial, Box 6jo, Washington, D. C. 



European subscriptiojts may be sent directly to the above address accompatiied 

 by Internatio7ial Postal Order for $i.i^ per atinuin, or they 7nay be sent to Messrs. 

 Triibner &= Co., 57 Ludgate Hill, London, or to Mr. W. P. Collins, 757 Great 

 Portland street, London, accompanied by the yearly price of five shillings. 



Microscopic Study of Woods.* 



By henry L. TOLMAN, 



CHICAGO, ILL. 



One of the most valuable aids in the determination of the value of 

 woods is afforded by the use of the microscope, and it is possible by a 



Yellow pine (Finns ponder osa). 



* From the Northzvestern Lumberman, to whose courtesy we are indebted for the use of the illustra- 

 tions. (In these figures the direction in which sap would flow is from right to left.) 



Copyright, 1890, by C. W. Smiley. 



