2 SCIENCE PROGRESS 



19 ; 191 7, 21, 185-98), Rev. de Metaphys. et de Morale (19 16, 

 23, 607^21), Rev. gin. des Set. (1916, 27, 502-10), and those 

 referred to in Science Progress (19 18, 12, 362-3). 



The thirteenth volume of Christiaan Huygens's (Euvres 

 Completes, containing his work on dioptrics of 1653, 1666, and 

 1685-92, was published at The Hague in 1916. 



F. Cajori (Colorado College Publication, Engineering Series, 

 191 7, 1, 245-53) has discovered an account of Newton's use of 

 logarithmic slide rules in securing rough approximations to 

 the roots of numerical equations in James Wilson's Mathematical 

 Tracts of the late Benjamin Robins of 1 761 , and reproduces, with 

 some useful comment, this account as well as the two other 

 known ones (in Oldenburg's letter of June 24, 1675, to Leibniz, 

 and E. Stone's article in his New Mathematical Dictionary of 

 1 743). Cajori remarks in passing that there are still manuscripts 

 of Newton which have never been minutely examined and have 

 not been published. Surely there is some reason to hope that 

 this may be rectified after the war. 



G. A. Johnston (Monist, 191 8, 28, 25-45) makes a most 

 valuable contribution to the history of mathematical philo- 

 sophy by bringing forward the doctrines stated in Berkeley's 

 early " Commonplace Book." His Analyst (1734) is also con- 

 sidered in a very illuminating way. (Cf. also the note on 

 some work by Cajori in Science Progress, 1917,12, 191.) 



A. C. Bose (Bull. Calcutta Math. Soc. 19 17, 7, 33-48) writes 

 on Fourier's life and work, and Philip E. B. Jourdain (Scientia, 

 191 7, 22, 245-54) considers the influence of Fourier's work on 

 the formation of conceptions in pure mathematics during the 

 nineteenth century. 



L. Mongardon (V Intermed. des Math. 19 16, 23, 180-82, 199) 

 gives notes for a bibliography of the works of Wronski. 



H. P. Banerji (Bull. Calcutta Math. Soc. 191 7, 8, 53-6) writes 

 on Sophie Kowalewski. 



J. H. Graf (Mitt, der Naturf. Ges. in Bern, 19 15, 50-69) 

 gives the correspondence of Ludwig Schlafli and C. W. Bor- 

 chardt from 1856-77. 



Logic, Principles, and Theory of Aggregates. — W. E. Johnson 

 (Mind, 19 1 8, 27, 1-2 1, 133-51) puts forward the view that 

 the preliminary treatment of thinking should be exactly the 

 same in both psychology and logic. This has of course an 

 extremely important bearing on the principles of mathematics. 



