1873 SCIENTIFIC WORK AFTER 1870 113 



was led to a novel and important analysis of the gill 

 plumes as evidence of affinity and separation. He em- 

 bodied the main results of his studies in a paper to the 

 Zoological Society, and treated the whole subject in a 

 more popular style in a book on the Crayfish. In a 

 somewhat similar way, having taken the dog as an object 

 lesson in mammalian anatomy for his students, he 'was 

 led to a closer study of that common animal, resulting in 

 papers on that subject to the Zoological Society in 1880, 

 and in two lectures at the Eoyal Institution in 1880. 

 He had intended so to develop this study of the dog as 

 to make it tell the tale of mammalian morphology ; but 

 this purpose, too, remained unaccomplished. 



Moreover, though he sent one paper (on Hypero- 

 dapedon Gordon!) to the Geological Society as late 

 as 1887, yet the complete breakdown of his health in 

 1885, which released him from nearly all his official 

 duties, at the same time dulled his ardour for 

 anatomical pursuits. Stooping over his work became 

 an impossibility. 



Though he carried about him, as does every man of 

 like calibre and experience, a heavy load of fragments of 

 inquiry begun but never finished, and as heavy a load of 

 ideas for promising investigations never so much as even 

 touched, though his love of science and belief in it might 

 never have wavered, though he never doubted the value 

 of the results which further research would surely bring 

 him, there was something working within him which 

 made his hand, when turned to anatomical science, so 

 heavy that he could not lift it. Not even that which 

 was so strong within him, the duty of fulfilling a promise, 

 could bring him to the work. In his room at South 

 Kensington, where for a quarter of a century he had 

 laboured with such brilliant effect, there lay on his 



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