1). C. Danielssen. 



17 



At the same time with this comprehensive activity as an author 

 on medical subjects, Danielssen display ed no less energy in treating 

 of zoology. 



Even whilst a student, he hacl shown a great feter est in the 

 study of natural history. In 1835 he accompaniecl Professor 

 M. N. Blytt on a botanical journey to Dovre, one of the most 

 interesting dis tri ets of Norway with regard to botany, and eol- 

 lected quite a rich herbarium, which was considerably increased by 

 gifts from Blytt and Boeck, and which he presented to the Bergen 

 Museum. Later on, when Danielssen settled in Bergen, he met 

 Michael Sars, then a curate at Manger, and Dr. Koren, after- 

 wards curator, both of whom were deeply interested in zoological 

 studies on the sea fauna of the west coast, which was at 

 that time little investigated. The influence of these men attracted 

 Danielssen also to zoology, in which his first works treated of the 

 history of the development of the lower sea animals of various 

 kinds, a branch at that time little explored, but in which Sars had 

 made very remarkable discoveries. Danielssen's most important 

 work on this subject is "Bidrag til Pectinibranchiernes Udviklings- 

 historie". He edited it jointly with Koren, who for many years 

 was Danielssen's faithful coadjutor, and certainly a very valuable 

 assistant, on account of the extensive knowledge of zoological litera- 

 ture he had acquired during many years' connection with zoological 

 studies. On the other hand, Koren had an intense objection to 

 writing and still more to appearing in print, and on the whole was 

 rather of an indolent disposition, and required to be pushecl on, 

 if he were to accomplish anything, and therefore his own inde- 

 pendent work is confined to one small paper. However much 

 Danielssen may have been indebted to Koren's zoological lore and 

 remarkable memory, especially when zoology was a new line to him, 

 it is still quite certain that none of their joint labours would have 

 seen the light without the active assistance of Danielssen. Besides 

 the above mentioned treatises, and some minor ones on development, 

 the most important of Danielssen and Koren's joint labours are 

 of a systematic nature, containing descriptions, systematieal and 

 anatomical, and delineations of numerous new animal forms from the 

 coast and from the investigations of the Norwegian North Atlantic 

 Expedition. The most important of these works are k 'The Norwegian 

 North Alantic Expedition" Vol. III: "Gephyrea"; Vol. VI: "Holo- 

 thurioidea" ; Vol. XII: "Pennatulicla" and "Nye Alcyonider; Gorgo- 



