176 SCIENCE PROGRESS 



urge. We might foster it if we knew what it meant ; but as 

 at present advised we disclaim it altogether. For a similar 

 reason we are unable to see in Creative Generation, Regenera- 

 tion, and Art Generation ; and, as to the development of the 

 procreative powers, we have never regarded metaphysics in 

 the light of an aphrodisiac. This book, however, deals with 

 metapsychics, not metaphysics ; it is a branch of philosophy 

 upon which we need not touch further in Science Progress. 



MATHEMATICS. By Philip E. B. Jourdain, M.A., Cambridge. 



The titles in these references are abbreviated in partial con- 

 formity with the Royal Society's Catalogue of Scientific Papers, 

 Subject Index, vol. i : Pure Mathematics (Cambridge, 1908). 

 Where the abbreviations used in this Catalogue are not formed 

 consistently with one another, or where the periodicals 

 mentioned here are not listed in the Catalogue, that usage 

 is still further departed from — but always in a perfectly 

 obvious way. 



The deaths have been announced of the following mathe- 

 maticians : Cyparissos Stephanos of Athens, Leon Autonne 

 of Lyons (January 12, 191 6) at the age of fifty-seven ; G. 

 Frobenius of Berlin (August 3, 191 7) at the age of sixty-seven ; 

 F. R. Helmert of Berlin (June 15, 191 7), at the age of 

 seventy-three; and Franz London of Bonn (February 17, 

 191 7) at the age of fifty-four. Obituary notices of S. B. 

 Maclaren, Sir W. D. Niven, J. G. Darboux, W. H. Besant, and 

 E. K. Wakeford are given in the P. L. Math. S. 191 8, 16, 

 xxxiii-lvii. 



Education. — A. J. Kempner (Arner. Math. Monthly, 191 8, 25, 

 201-10) has an elementary note, which will be of interest to 

 teachers, on the greatest and least values of analytic functions, 

 and on the smallest integer m 1 divisible by a given integer n. 

 A very interesting feature of this Monthly is the accounts of 

 the really great work that is being done in most American 

 universities in the formation of undergraduate mathematical 

 clubs, in which discussions take place and lectures are given 

 — often by the students themselves — to show that mathematics 

 is a living thing with a history and even human interests. 

 Particularly valuable are the well-documented suggestions of 

 suitable topics. Naturally D'Arcy Thompson's recent book 



