OBITUARY. 113 



the first automatic microtome, but later he was sent to Australia, 

 where he discovered the egg-laying of the Monotremes. Heape was 

 concerned with the early stages of mammalian development, and 

 Hickson, who soon largely took charge of the advanced teaching, was 

 actively interested in the Alcyonaria, and made his discovery of the 

 medusae of Millepora. 



In the midst of such activities Sedgwick's own work necessarily 

 suffered, but his published papers show that he was thinking deeply 

 about the origin of metameric segmentation, and of the central canal 

 of the nervous system of Vertebrates. Balfour and Moseley had 

 both been interested in Peripatus, and in 1883 Sedgwick went to the 

 Cape, from which he brought back over three hundred live specimens. 

 His subsequent ' Monograph on the Development of Peripatus 

 capensis ' obtained for him election into the Eoyal Society. It is a 

 classical work, and a model of how such a research should be carried 

 out and presented. It showed the relationship of Arthropoda to An- 

 nelida, now expressed in the use of the phylum-name Appendiculata. 

 It suggested important considerations as to the origination of the 

 Metazoa from the Protozoa, and of the Triploblastica from the 

 Actinozoa. It clarified the whole question of the morphology of 

 the body cavity, coelom and haemocoele in all higher animals. ' A 

 Monograph of the Species and Distribution of the Genus Peripatus ' 

 followed, while W. L. Sclater, Miss Lilian Sheldon, and A. Willey at 

 different times worked in Sedgwick's laboratory on the development 

 of species from South America, New Zealand, and New Britain. His 

 own last thoughts on the group were only published in 1908 in a 

 paper on its distribution and classification. 



The growth of Sedgwick's department at Cambridge and of his 

 broader zoological activities allowed him little subsequent leisure for 

 detailed researches. He twice served on the Council of the Boyal 

 Society, and sat for many years on its zoological committees. He was 

 associated with Lankester in the production of the ' Quarterly Journal 

 of Microscopical Science.' He was President of the Zoological 

 Section of the British Association at Dover, and he was con- 

 sulted not only by his old pupils (with the zoological work of all 

 of whom he kept closely in touch), but by zoologists all over the 

 world. 



Occasionally he was stimulated to break out on some question on 



which he thought zoology in general was going astray. In 1894 he 



published his views on ' The Significance of Ancestral Rudiments in 



Embryonic Development,' and at the meeting of the International 



Zool. Uh ser. vol. XVII., March, 1913. K 



