516 PROCEEDINGS OF THE ACADEMY OF [1897. 



Horn was early thrown into association with Dr. John L. Le- 

 Coute, whose prominence as a coleopterologist was undisputed. The 

 mutual regard then established led to community of study and was 

 only interrupted by death. 



Dr. Horn's fourth paper, also published in 1860, was on new spe- 

 cies of North American coleoptera in the cabinet of the American 

 Entomological Society. His later contributions to science, the ex- 

 tent and value of which will be treated of by one eminently qualified 

 to do so, were, with one or two exceptions, devoted to this specialty, 

 as an authority on which Dr. Horn certainly had on rival in 

 America at the time of his death. 



Having passed the required examination, Dr. Horn received a 

 commission as Assistant Surgeon in the United States Army, March 

 1, 1863. He was attached to the 2d California Cavalry, Depart- 

 ment of the Pacific, until July 14th of the following year, when he 

 was commissioned as surgeon of the 1st California Infantry Volun- 

 teers, remaining in that position until the term of service of the regi- 

 ment expired, Dec. 3, 1864. He was again mustered into service 

 May 22, 1865, as assistant surgeon of his old regiment, the 2d Cali- 

 fornia Cavalry, and commissioned as surgeon of the 2d California 

 Infantry, September 23, 1865. His service terminated with that of 

 the staff of his regiment, April 16, 1866. 



During his military service in the west he improved the oppor- 

 tunity to make extensive additions to his collection of coleoptera, 

 and was intimately associated with the California Academy of Sci- 

 ences. 



On his return to Philadelphia he devoted himself to the geueral 

 practice of medicine, his field being in the northwestern section of 

 the city, with which he had been identified nearly all his life, and 

 wdiere he was held in the highest esteem by those to whom he min- 

 istered as a physician. lie was especially skilful as an obstetrician, 

 and hundreds of families felt that they had suffered irreparable loss 

 when he retired from the duties of active practice a few years before 

 his death. 



Dr. Horn's devotion to science was singularly undivided. Al- 

 though every obligation of his profession was regarded by him as 

 binding, he practised medicine merely as a means to an end. He 

 found at once his relaxation and intellectual profit when, after an 

 exhausting day of attendance on the sick, he was at leisure to pore 

 over his cherished insect-cases until far into the night. Not having 



