IV PREFACE. 



intelligence to understand the manipulations of the instrument sufficiently 

 well for him to go to work without delay, and then with the aid of the illus- 

 trations he will be able to recognize the various forms described in the fol- 

 lowing pages. 



The illustrations for the chapter on "Urinary Deposits" were prepared 

 with unusual care. The strictest attention was given to the most minute 

 detail in the preparation of the original specimens. As soon as prepared 

 they were given to Mrs. Stowell, who made the drawings with her acknowl- 

 edged accuracy. These drawings were then given to the engravers with 

 instructions to carry out the artist's design in every particular. The proofs 

 were carefully examined, and as a result I feel assured that neither mote 

 beautiful nor more accurate representations of the various urinary deposits 

 have been offered to the public. 



The second part of the work consists largely of original articles con- 

 tributed by Mrs. Stowell during the past two years to prominent journals. 



This work in Vegetable Histology has been sadly neglected in this 

 country. It is Mrs. Stowell's purpose to add, from time to time, to the present 

 list of subjects until it shall embrace the great majority of the medicinal 

 plants. It is the beginning of a task never before attempted in this country, 

 and the beauty and truthfulness of the drawings together with the text are 

 sufficient to class it as an unique contribution to our meagre knowledge of 

 Vegetable Histology. 



The articles on "The Study of Wheat" originally appeared in the 

 American Miller of Chicago. 



The articles on Eucalyptus Globulus, Jaborandi, Sarsaparilla, Fucus 

 Vesiculosus and Ustilago Maidis, were contributed to Leonard's Illustrated 

 Medical Journal of Detroit. 



The articles on Boldo leaves, Alstonia Scholaris, Folia Carobae and 

 Jamaica Dogwood, appeared in The Therapeutic Gazette, of Detroit. 



Thanks are due to the editors of these journals for the use of the cuts 

 illustrating the text. 



Dr. Leonard also loans the cuts illustrating the chapter on ' The Micro- 

 scope in Skin Diseases"; these cuts were made for his work on "The Hair." 



Mr. Fred. K. Stearns, wholesale druggist, of Detroit, has shown similar 



favors. 



CHAS. H. STOWELL. 



" HlSTOLOGICAL LABORATORY," ) 



UNIVERSITY OK MICHIGAN. ( 

 OCTOBER, 1882. 



