4 o 4 THE POPULAR SCIENCE MONTHLY. 



At the meeting of the German scientists and naturalists in Bonn, in 

 1857, Mohr's interest was so much drawn toward the problems of ge- 

 ology that he henceforth devoted much study and research to geologi- 

 cal investigations. Besides a series of excellent popular essays in 

 " Westermann's Monatsheften," in 1866 appeared from his fruitful 

 and highly appreciated pen a A History of the Earth," in which he 

 advanced and sustained novel views on the origin of anthracite coal, 

 the deposits of lime in the seas through the agency of plants, the occur- 

 rence of magnetic iron in basalt, and of metallic iron in meteorites, etc. 



Mohr's works and writings, extending over a wide sphere of the 

 physical and applied sciences, are characterized by strict scrutiny, clear- 

 ness, and attractiveness ; his attainments, learning, and eloquence were 

 widely appreciated ; during many years he delivered popular lectures 

 on various branches, or special topics, or problems of chemistry or 

 geology, at Coblentz, Bonn, Cologne, and other cities, and these lec- 

 tures drew large audiences of the most cultured classes of society; the 

 present accomplished Empress of Germany was, during her many years' 

 residence in Coblentz, among his devoted hearers. His popular essays 

 in " Westermann's Monatsheften " in " Gaea," in the " Cologne Ga- 

 zette" and other German journals, were ever-welcome literary con- 

 tributions of the highest order, and also entered largely into the liter- 

 ature of other nations. Distinctions and honors, never courted by 

 his independent and stern character, were not wanting for him, both 

 at home and abroad. Among American societies, the American Phar- 

 maceutical Association and the Philadelphia College of Pharmacy had 

 elected him an honorary member in 1868. 



One year before his death, Mohr delivered, on the occasion of the 

 annual meeting of the " German Apotheker Verein " in Coblentz, in 

 September, 1878, his last address to the representatives of his original 

 vocation an oration which obtained a wide and just fame for its mas- 

 terly exposition of the past, the present, and the future mutual re- 

 lations of chemistry, pharmacy, and medicine, and of the accomplish- 

 ments of pharmacy for the progress and growth of the other two. 



Risen like his famous contemporaries Woehler, Heinrich Rose, 

 Wiggers, Liebig, and others, from the ranks of pharmacy, and carried 

 far off from her special sphere by his application and labors during 

 an active career, Mohr again and again betook himself to his alma 

 mater, and, perhaps more than any one of his collaborators contributed 

 to maintain the high place and reputation of German pharmacy in the 

 domain of physical research ; and, among the many eminent scholars 

 and investigators of his time whose names adorn the records of advance 

 in sciences and arts, Friedrich Mobr's name will be an imperishable 

 one in the history of pharmacy and of her offspring chemistry. 



