27fi H. BALDWIN WARD 



contagions diseases (1). From this date his attention seems to hâve 

 been directed chiefly toward the study of parasites and of Rhizo- 

 pods. His observations on the latter culminated in his monograph 

 previously noted and it seems to hâve been his intention expressed 

 on several occasions to publish an elaborate illustrated work on 

 parasites, but this intention was never carried ont, though his 

 briefer articles follow one another rapidly, alternating with notes 

 on fossils and occasional références to other topics, until the sum 

 total of thèse helminthological contributions reached one hundred 

 twenty out of 550 articles listed from his pen. It is striking tliat 

 his last paper which was presented to the Philadelphia Academy 

 on mardi 1U"\ but not printed until after his death, sliould hâve 

 been one of this séries of helminthological notes. 



Distinguished honors were conferred upon this famous natura- 

 list both at home and abroad. He was made an honorary member 

 of a long list of Societies of national and international repute, and 

 in 1886 Harvard University conferred upon him the degree of Doc- 

 tor of laws. In 1879 the Boston Society of Natural History awarded 

 to him the Walker Grand Prize, which, as a spécial récognition 

 of his contributions to science, was raised to ^1,000 ; and in the 

 same year he received a medal from the Royal Microscopical Socie- 

 ty of London. Five years later the Geological Society of London 

 awarded him the Sir Charles Lyell medal for paleontological 

 researches, and in 1886 he received from the Academy of Sciences 

 at Paris the Cuvier medal for his investigations in comparative 

 anatomy. 



Personally Leidy was a man of most attractive character. Though 

 an indefatigable worker, as shown by his extensive contributions 

 to science, he was of social disposition and enjoyed the society of 

 his friends. His unafïected simplicity and entire absence of self- 

 conceit attracted those with whom he was brought in contact and 

 inspired the utniost conhdence. Controversy of any sort was most 

 distasteful to him and he not only frequently submitted to injus- 

 tice or imposition, such as to provoke the humorous excuse of a 

 friend « Oh ! he is an Invertebrate ». 



To his helminthological work numerous références bave already 

 been made. He brought together a vast amount of material and 



(1) Frocecd. Àcad. of nat. se. J^hiUulelykia, 1871, p. 297. 



