THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Vol. XV. MARCH, 1894. No. 3. 



Studies of the Histology of Various Mammalian Tissues. 



ItV HENKY L. OSBOKX, 



ST. PAUL, MINN. 



WITH FRONTISPIECE. 



Prefatory NOTE. — It has seemed desirable to print in 

 the pages of this Journal a series of articles with illustra- 

 tions describing minutely the cellular structure of some 

 of the tissues of the highest vertebrates. The intention 

 is to pre})are a series which by the help of the text and 

 the cuts will make it possible for anyone wlio has a good 

 microscope with ordinary range of magnifying power to 

 distinguish in sections prepared with only ordinary 

 methods and care, the essential cellular structure of the 

 more familiar organs. My object in this is to furnish 

 persons, intending to study human physiology, with fig- 

 ures drawn directly from average sections such as they 

 can make with reasonable care, to the end that they may 

 by studying these cuts and sections better acquire the 

 practise needed to teach one to interpret directly from 

 nature instead of l)eing confined as so many are to the 

 plan of resorting to a manual of histology if they desire 

 to learn the cellular structure of organs. 



Technical methods of preparation.— All of the sec- 

 tions herein figured or most of them have been prepared 

 by hardening in alcohol. The finest histological work 

 requires that more careful hardening be practised than 

 is possible with alcohol, but beginners in histology, or any 

 others who are not in search of minuter cytological and 



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