422 HERMANN AUGUST HAGEN. 



tion to the Museum knew no bounds ; all personal interests were 

 secondary. In 1876 he refused a most flattering and urgent invitation 

 to take charge of the great entomological collections of the Konigliches 

 Museum fur 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 both in size and value. The bio- 

 logical 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, larvae 

 in all stages from those just hatched to those full grown, their barrows, 

 nests, partially devoured leaves, etc., the work of both larvae and 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 collections 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 counsel 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 Northern Transcontinental Survey, he 

 visited California, Oregon, Washington, and Montana. The object of 

 the survey was to collect data concerning insects injurious to vegeta- 

 tion, both of the field and of the forest. The greater part of the time 

 was spent in the Yakima and Columbia regions of Washington ; many 

 important entomological discoveries were made, some with a direct 

 economic bearing, and large collections of insects were obtained from 

 a most interesting locality. I had the good fortune to be one of the 

 party accompanying Dr. Hagen on this occasion, and saw everywhere 

 his delight at the great natural beauties of the country, and if the 

 many discomforts, inseparable from such a trip to a man at the age of 

 sixty-five, were borne with not a little impatience, yet his enthusiasm 

 and determination assured his companions that the expedition would 

 be carried to the end he had planned for it. In after years his expe- 

 riences during the summer of 1882 were among the most enjoyable of 

 his memories. 



