Annual Report of the Council. 237 



kindness of Professor Cay ley, these volumes are in the 

 Society's Library. 



In one of his researches we may claim a special 

 interest. The number of hydro-carbons in different 

 groups was naturally a matter of interest to Professor 

 Schorlemmer, and, having failed to interest a distinguished 

 German mathematician in the subject, he was advised to 

 suggest the problem to Cayley. Schorlemmer expressed the 

 greatest admiration for a statement of the question, asking 

 whether it was exact, which he received by return of post, and 

 the answer was returned within a fortnight. The paper was 

 published in 1875 {Brit. Ass. Report, pp. 257-305). This is 

 an illustration of the wide interest which Cayley took in all 

 scientific matters. 



In manner Cayley was modest and retiring; his 

 relaxations were travelling, walking, and climbing, water- 

 colour painting, and the study of architecture. To 

 this we must add novel reading. He was famed for 

 his novel reading as an undergraduate, and continued 

 the practice through his life. For some years Cayley 

 suffered from a painful internal malady, and for three 

 years it had undermined his health, and gave him few 

 intervals of relief from pain. On the 26th of January, 1895, 

 he got relief by death. In time, a proper estimate of his 

 work will no doubt be arrived at ; at present, to his contem- 

 poraries, it seems gigantic. He was elected an honorary 

 member of the Society in 1859. The following is a list 

 of his contributions to our publications : — 



i860. On the A faced Polyacrons, in reference to the Problem of the Enu- 

 meration of Polyedra. 



(Proc, Vol. II. (1862), pp. 3-4; Menu, Ser. 3, Vol. I. (1862), 

 pp. 248-256). 

 1862. Note on a Differential Equation. 



(Proc, Vol. II. (1862), p. 193, Mem., Ser. 3, Vol. II. (1865), 

 pp. m-114). 

 1877. On Compound Combinations. 



(Proc, Vol. XVI. (1877), pp. 113-114; Mem., Ser. 3, Vol. VI., 

 (1879), pp. 99-100). R p q 



