OF WASHINGTON. 197 



ton Dr. Marx devoted a great deal of time to the study of the Arach- 

 nida, as his magnificent collection and valuable library, as well as 

 the list of his published papers, will testify. He became known 

 as one of the foremost living authorities upon this class of ani 

 mals, yet he also found time to study medicine at the medical 

 school of the Columbian University, from w r hich institution he 

 was graduated with the degree of M. D. in 1885. He w r as a 

 charter- member of the Entomological Society of Washington, 

 and its fourth President. He presented many valuable papers 

 before the Society, and was from the start one of its foremost 

 members. He maintained intimate relations by correspondence 

 with the foremost arachnologists of Europe, and was selected by 

 the publishers of Count Keyserling's Spinnen Amerikas to 

 complete the work on the death of the distinguished author. 

 Keyserling, Thorell, Simon, and Kulszynski have received much 

 valuable material and information from Dr. Marx, and American 

 students notably McCook, Emerton, and Peckham have been 

 under obligations to him in similar relations. His artistic talent, 

 of course, greatly helped him in his studies, and the various 

 plates and figures which adorn his contributions to science are by 

 far the best illustrations of Arachnids that have ever been pro 

 duced in America. 



Nearly three years before his death he began to devote his 

 spare moments to the study of the ticks, of which he contem 

 plated publishing ultimately a monograph. A few preliminary 

 papers on the subject w r ere read by him before the Entomological 

 Society of Washington, but the attacks of the dreadful disease 

 to which finally he was to succumb, after many months' suffering, 

 frustrated all his plans. Still, the hope of restoring his health 

 never abandoned him, and at the last meeting of the Entomo 

 logical Society which he attended (October, 1894) he exhibited 

 and explained in an informal way a plate which was to accom 

 pany a paper on ticks. This plate we reproduce as an example 

 of his later style of work, as well as on account of its scientific 

 value. The accompanying explanation is from his pen. 



Personally, Dr. Marx was the most companionable of men. 

 Genial and witty, he was at the same time earnest, and a man of 

 wide reading and general information. American science can ill 

 afford his loss. 



