ENTOiMOLOGICAL SOCIETY OF ONTARIO. 123 



He was corresponding or honorary member of a large number of learned societies. In 18G7 

 Professor Agassiz invited him to come to Cambridge as assistant in entomology, and in 

 1870 he was appointed Professor of Entomology in Harvard University.* 



" Dr. Hagen entered upon his duties at the Museum with great zeal ; and his detailed 

 plan for the arrangement of the collections, though somewhat modified, is, and is likely 

 to remain, the basis for the future. Deeply interested in everything relating to museum 

 work, as his appreciation of series of specimens, his care for their preservation and for the 

 accuracy of their localities, and many minor details, clearly indicate, it is in this collection 

 as well as in his writings that his contributions to science are to be found. Here alone 

 we can fully realize the extent of h'is discoveries, the keenness of his insight, his skill at 

 preparation and dissection, and with the pencil. His devotion to the Museum knew no 

 bounds ; all personal interests were secondary. In 187G he refused a most flattering and 

 urgent invitation to take charge of the great entomological collections of the Konigliches 

 Museum fiir Naturkunde in Berlin, and the time that might have been given to original 

 work was lavished upon the care and arrangement of the collections, which grew rapidly 

 boch in size and value. The biological collection, or that illustrating the life history of 

 the species, is a prominent specialty of the Cambridge Museum. In this are preserved 

 specimens showing every condition of an insect's life, the eggs, larv;i' in all stages, from 

 those just hatched to those full-grown, their burrows, nests, partially devoured leaves, etc., 

 the work of both larv;r aiipl adults, the frass or excrements often of great importance, 

 pupal stages, adults of both sexes, and the parasitic and predaceous enemies, also in all 

 stages of development. Dr. Hagen's influence upon the formation of such biological col- 

 lections has been very great ; few were in existence at the time when, almost unaided, he 

 created that at Cambridge, and the care and elaborateness with which the whole is 

 labelled makes it not only a worthy model, but most truly a monument to persistent and 

 well-directed industry. 



" His lectures, given at rare intervals to advanced students, contained much 

 genuine and exact knowledge, and his many acts of kindness and words of wise coun- 

 . sel will not soon be forgotten by those who enjoyed the facilities of the Department 

 under his charge. 



" Most of Dr. Hagen's journeys were undertaken for study among collections and 

 in libraries. In the summer of 1882, however, accepting the generous and thoughtful 

 invitation of Professor Raphael Pumpelly. at that time Director of the Nofthern 

 Transcontinental Survey, he visited California, Oregon, Washington and Montana, 

 The object of the survey was to collect data concerning insects injurious to vegetation, 

 both of the field and of the forest. The greater part of the time was spent in the 

 Yokima and Columbia regions of Washington ; many important entomological discov- 

 eries were made, some with a direct economic bearing, and large collections of insects 

 were obtained from a most interesting locality. 



" Dr, Hagen was a man of marked character, simple and sympathetic, and if at 

 times somewhat hot and hasty in temper and impatient of opposition, he had also one 

 of the warmest of hearts and most generous of dispositions. His unostentatious hos- 

 pitality was enjoyed by many entomologists, who found his life in Cambridge quiet, 

 contented and happy. 



" Of Dr. Hagen's domestic life it is sufficient to record here that in 18-51 he 

 married Jofianna Maria Elise Gerhards, who survives him. 



" Dr. Hagen received the honorary degree of Doctor of Philosophy from the Uni- 

 versity of Konigsberg in 1863. Harvard made him a Doctor of Science in 1887. 

 The renewal of his medical degree oh the 17th of October, 1890, the date of his gradu- 

 ation fifty years previously, after the custom of German Universities, gave him great 

 pleasure. He was elected a fellow of the American Academy of Arts and Sciences, 

 November 11, 1868, and served on the Council in 1877-78. He was also a member 

 of a goo.lly number of scientific associations and most of the entomological societies 

 the world over v,-ere glad to enroll him as an honorary member. 



'From '• Biograpliies " following Thomas S. C.ary's sketch, " The ^Museum of Comparative ZooJogv," 

 in The Harvard Book, by F. O, Yaille and H. A. Chirk. Caiiil.ri<is,'.s 1875, Voh T,, i. ;Ur.-:Wi'>. with 

 portrait. 



