Vll 



tidae by a natural classification ; his previous detection of the funda- 

 mental differences between the pits of Temnopleurus and the fossettes 

 of T&mnechinus gave him the clue to the arrangement of that group ; 

 and his substitution of positive for comparative diagnoses in many 

 recent genera has greatly aided the comparison of the fossil and deep- 

 sea types. By these two revisions alone Professor Duncan has earned 

 the gratitude of every palaeontologist and zoologist, and has given a 

 firm tjasis for future work. They are indispensable works of refer- 

 ence to every student of these groups. 



In addition to the Corals and Echinodermata, Professor Duncan 

 made some contributions to the study of the Protozoa and Sponges, 

 while his clearness as a teacher led him to undertake a good deal of 

 lecturing and popular literary work ; thus he edited the six volumes 

 of ' Cassell's Natural History,' and, amongst others, wrote a primer 

 of physical geography, a volume of biographies of the 'Heroes of 

 Science,' a paper on Voltaire's attitude to geology, and edited recent 

 issues of Lyell's ' Student's Elements.' 



To his first love, the Corals, he proposed to return on the conclusion 

 of his revision of the Echinoidea ; he commenced work upon a large 

 Indian collection, and planned a supplement to his revision of the 

 Madreporaria, in which he intended to discuss recent criticisms and 

 incorporate subsequent progress. But it was not to be. He was 

 smitten with disease, and, after a long and painful illness, quietly 

 passed away on the early morning of the 28th of May. 



The fine, keen sense of humour, which remained unblunted almost 

 to the last, the genial kindness with which he was ever ready with 

 help, especially to younger men, united with the recognition of his 

 sterling worth and sound judgment, gained him wide popularity and 

 esteem. 



HENRY MARTYN JEFFERY was the only son of Mr. John Jeffery, of 

 Gwennap, Cornwall, a parish situated about midway between the 

 towns of Redruth and Penryn. He was born on January 5, 1826, at 

 Lamorran, near Truro, on the banks of the River Fal, at the rectory 

 of his maternal grandfather, the Rev. W. Curgenven, who married 

 the sister of the distinguished Orientalist and missionary, the Rev. 

 Henry Martyn, B.D., the Senior Wrangler in 1801. Mr. Jeffery was 

 also related to the family of the Rev. Malachy Hitchins, Vicar of 

 St. Hilary, near Marazion, the comparer of the "Nautical Almanac," 

 under Dr. Maskelyne, from 1767 to 1809, and one of the observers of 

 the transit of Venus at the Royal Observatory in 1769. Mr. Jeffery 

 always referred with a natural pride to these two well-known mathe- 

 matical members of his family. 



The early years of Mr. Jeffery were mostly spent at his father's home 

 at Gwennap, but from the age of seven to fourteen he was a pupil at 



