80 Scientific Intelligence, 



4. Applied Mechanics-, by John Perky, F.R.S., pp 678, 

 with 371 illustrations and 25 tables. London, 1897 (Cassell &■ 

 Co.). — This book embodies the course of instruction in Applied 

 Mechanics at the Finsbury Technical College, which is based on 

 the laboratory method, each student being furnished with tools for 

 measuring the quantities used in every discussion. It is described 

 in the title as " a treatise for those students who have time to 

 work Experimental, Numerical and Graphical Exercises illustra- 

 ting the Subject," and contains a wealth of material sufficient to 

 equip a student in engineering with as ample and practical a store 

 of knowledge as most would have time to appropriate. The 

 style and arrangement are, like the subject-matter, excellent. 



w. B. 



5. Fifty-second Annual Report of the Director of the Astro- 

 nomical Observatory of Harvard College for the year ending 

 September 30, 1897 ; by Edward C. Pickering. — The Report of 

 Professor Pickering just issued gives a summary of the work 

 done at Cambridge with the various observatory instruments ; 

 also of the photographs taken under the Henry Draper memorial, 

 which have led, for example, to the discovery of 17 new variable 

 stars ; of the work at the station at Arequipa, Peru, and that at 

 the Blue Hill Observatory. 



6. Ostwald^s Klassiker der exakten Wissenschaften, Leipzig, 

 1897 (Wilhelm Engelmann). Recent publications of this valua- 

 ble series include the following : 



Nos. 88, 89. Krystallometrie oder Krystallonomie und Krystallographie. Von 

 Johatm Friedrich Christian Hessell. (1830.) Brstes Bandchen. 192 pp. Zweites 

 Bandchen, 165 pp. 



No. 90. Abhandlung iiber di%Systeme von regelmassig auf einer Ebene oder 

 im Raum vertheilten Punkten. Von A. Bravais (1848). 1897. 142 pp. 



No. 91. Untersuchungen iiber verschiedene Anwendungen der Infinitesimal- 

 analysis auf die Zahlentheorie. Von G-. Lejeune Dirichlet. (1839-1840.) 1897. 

 128 pp. 



No. 92. Ueber den naturlichen Zusammenhang der organischen mit den 

 unorganischen Verbindungen, etc. Von H. Kolbe (1859.) 1897. 42 pp. 



Science Readers, by Vincent T. Musche. Revised and adapted for use in 

 schools, with a preface by Mrs. L. L. "W. Wilson, Ph.D., Philadelphia Normal 

 School. Book I, 127 pp. Book II, 128 pp. Book III, 176 pp. Book IV, 216 

 pp. New York, 1897 (The Macmillan Company). 



La Vie, mode de mouvement, Essai d'une theorie physique des phenomenes 

 vitaux, par E. Preaubert, professeur au Lycee d'Angers. Paris, 1897 (Felix Alcan). 



Obituary. 



Professor Winnecke, the distinguished astronomer, died at 

 Bonn, on Dec. 3, 189V. 



Rev. Samuel Haughton, D.D. of Dublin died on October 31, 

 1897. He was a man of keen, original mind and his scientific 

 writings include a wide range of topics in Mathematics, Geology, 

 Physical Geography as well as in his own department of medicine. 



