THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL, 



Vol. XL 



MARCH, 1890. 



No. 3. 



All cotin/ninicaf ions for this Joiirnal, whether relating to business or to editorial 

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

 can Monthly Microscopical Journal, J3ox 6jo, Washingto7t, D. C. 



European subscriptions may be sent directly to the above address accompanied 

 by International Postal Order for $i.ij per annum, or they may be sent to Messrs. 

 Triibner &^ Co., j/ Ludgate Hill, London, or to Mr. IV. P. Collins, ijy 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 



Fig. 3. — YuUuw pine yrinus />ondc> oiu) 



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

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



Copyright, 1890, by C. W. Smiley. 



