JlLY 3, 1<)03.] 



SCIENCE. 



uable, yet, after a score of years, it must 

 be conceded that not a few of the sug- 

 gestions, which were most unsatisfactory 

 at the time, have proved to be of lasting 

 value. As if these occupations were not 

 enough, he made frequent field studies, de- 

 livered many addresses and lectured to the 

 college classes. Such unceasing toil told 

 even on his extraordinary constitution; 

 several times he was compelled to abandon 

 everything abruptly at the close of the 

 winter's work and to flee to Switzerland, 

 where, with Desor and other friends, he 

 would spend two months of absolute free- 

 dom from all care — but only to return to 

 work at the same terrific pace, to make 

 ready for another collapse. 



The hundred volumes of reports giving 

 the results of the Second Survey are his 

 monument. He gathered around him a 

 group of earnest workers into whom his 

 own spirit was infused ; in most instances 

 he gave them free scope and was repaid 

 by honest investigation. At the close of 

 the survey work he undertook to prepare 

 a final report; but the close application, 

 which he deemed necessary, brought on the 

 final break after he had completed the re- 

 port up to the end of the Lower Carbon- 

 iferous. In this marvelous compilation he 

 gave a synopsis of every assistant's work, 

 according unreserved recognition to each 

 observer and frequently showing an un- 

 selfi.sh neglect of credit due to himself for 

 earlier discovery of facts and determina- 

 tion of principles. 



Keen in perception, quick in compre- 

 hension. Professor Lesley at times reached 

 conclusions too hastily, but no man was 

 quicker than he to acknowledge an error. 

 His broad reading and tenacious memory 

 made him a well-furnished scholar; his 

 cheery di.sposition made him an attractive 

 companion. He knew little of the world 

 and cared le.ss for it; he was a typical 



student, who in worldly matters never out- 

 grew his college days. Honest and true, 

 he never remembered an injury, he never 

 forgot a kindness. His faults were those 

 of a whole-souled generous man. 



For ten years Professor Lesley was laid 

 aside from all labor, but he bore his afiSic- 

 tion with more than patience and at last 

 he passed away peacefully, without suffer- 

 ing, literally crossing the threshold in sleep. 



In 18'f9 Professor Lesley married Susan 

 I. Lyman, of Northampton, Mass., who, 

 with two daughters, survives him. 



John J. Stevenson. 



AN ASPECT OF MODERN PATHOLOGY.* 

 It is a truism to assert that the great 

 progress made in pathology during the past 

 century is the result of the study of cellular 

 structure and activity. The close of the 

 nineteenth century has witnessed no lessen- 

 ing of the interest of pur.suit of this study ; 

 but it has seen arise an endeavor to pene- 

 trate more deeply into the nature and prop- 

 erties of cells through which their manifold 

 activities are brought about. Armed with 

 a rich harvest of facts and methods sup- 

 plied by physiological chemistry, investi- 

 gators have attacked the question of the 

 internal constitution of the cell with re- 

 newed vigor, and the degree of success of 

 this effort is indicated by the .strides made 

 within the past two decades in unraveling 

 the phenomena of immunity and allied 

 states. The twentieth century has received 

 from its predecessor a rich heritage of 

 facts and principles relating to the inti- 

 mate structure and function of cells, which 

 is destined to yield a fruitage of great im- 

 portance to physiologj', pathologj^ and prac- 

 tical medicine 



I find myself in the enviable attitude of 

 dealing with certain topics in experimental 



* Read at the annual meeting of the Medical 

 nnd Chirurgical Faculty of Maryland, April 24, 

 1903. 



