1897.] NATURAL SCIENCES OF PHILADELPHIA. 531 



he fixed a standard below which no future worker may fall if he 

 desires to obtain recognition, or to be considered other than an 

 amateur. In other countries his methods and conclusions were at 

 first opposed, then tolerated, and now some of the younger workers 

 are beginning to follow him. In the United States almost all recent 

 work has been on the models furnished by him. There is only one 

 notable exception. His influence appears strongly in almost every 

 paper on Coleoptera that has been published in the United States 

 during the last decade, and no doubt so long as these writers con- 

 tinue, this influence will be felt. He has set the example of thor- 

 oughness, and nothing else will be acceptable in the future. He has 

 •constantly taught us that individuals are parts of an aggregate 

 species, and that species are not isolated facts or productions but 

 parts of a great scheme which it is the work of the systematist to 

 unravel. This is the impression gained from his work and such 

 were his verbal statements at society and other meetings. The in- 

 fluence of this teaching will be felt throughout at least the present 

 generation. In breaking away from the older schemes of classifica- 

 tion and seeking characters, not only in one organ or any one set of 

 organs or appendages, but everywhere on the body ; in proving that 

 nothing is too insignificant to be studied and to have a meaning, he 

 has rendered a service, not only to Coleopterology, but to entomo- 

 logy at large, which will not be estimated at its true worth for some 

 time to come. 



He early impressed upon me, the important fact that the only 

 true way to do systematic work is to ascertain how the species under 

 consideration had developed, and this perhaps is the true secret of 

 his success in untangling many of the problems in the classification 

 of the Coleoptera. The certainty with which he seized upon the im- 

 portant characters, though sometimes almost the most inconspicuous 

 as well, seemed often little short of marvellous, and when once he 

 had the clue, the persistence with which he followed it and the skill 

 with which he showed how what was, had come to be, challenged 

 the admiration of all who used the published results of his labors. 



The strength of his faith in the correctness of his system is shown 

 by the fact that several times when he found what he considered un- 

 warranted breaks, he predicted the discovery of other species with a 

 stated combination of characters ; and these species have been in 

 most cases, actually discovered. It is not the least of Dr. Horn's 

 services to Coleopterology that he has set so clear an example as to 



