The Microscope 



AND ITS RELATION TO 



Medicine and Pharmacy. 



^°^ " ). ,4 Ann Arbor, February, 1883. No. 6 



WHOLE NO. 12 ) 



CONTENTS. 



PAGE. 



Original Communications. 



The Use of t^e Microsco-e in Geology. 

 By Alexander Winchell, LL.D 177 



Some Hints on the Preparation and 

 Mourning of Microscopic Ubjects. 

 By W H Walmsley 179 



The Podjra Scale. By A. Y Moore, 186 



Microscopical Examination of Pow- 

 dered Vegeiablu Drugs as Obtained 

 from Wholesale Dru. gists. By C. 

 L. Becker 188 



PAGE 



A Country Doctor and His Micros- 

 cope. Some of His Early Cases. 



By W. W. Munson, M. D igo 



Translations. 



Prp iration of Diatoms. By Prof. J, 



Brun 19 1 



Society Proceedings 192 



Correspondence 198 



Editorial Department 199 



Selections 201 



Items 206 



Reviews 208 



^miittimiit^ti^ns. 



THE USE OF THE MICROSCOPE IN GEOLOGY. 



BY ALEXANDER WINCHELL, LL. D., PROFESSOR OF GEOLOGY AND 

 PAL/EONTOLOGY, UNIVERSITY OF MICHIGAN. 



A PRETTY regular perusal of the literature of microscopy has 

 led me to notice that, in America especially, the attention of 

 those who use the microscope is directed chiefly to the forms and 

 structures of the living organism. Of course, the study of fossil 

 DiatomacecB constitutes a conspicuous exception. It would be well, 

 it seems to me, if a larger number of observers would interest them- 

 selves in the subjects of microscopic inquiry presented by geology. 

 Palaeontology and lithology both offer extremely inviting fields. 

 Tliey are inviting both from the intrinsic interest and importance of 

 the investigations, and from the extraordinary beauty of many of 

 the preparations. It is true that the requisite appliances, labor and 

 dexterity for the production of good specimens, may explain much 

 of the neglect of geology in microscopical manipulations and 

 studies. But I do not consider these hindrances serious, and I 

 therefore take the liberty to offer a few suggestions. 



