386 v Scientific Intelligence. 



3. Elements of the Differential and Integral Calculus 

 (Revised Edition) ; by W. A. Granville. 8vo, pp. xv, 463 

 (Ginn & Co.). — Professor Granville's removal from the sphere of 

 teaching to a college presidency will, it is to be feared, terminate 

 his activity in the production of text-books in Mathematics. His 

 Calculus is unequaled by any we know in the number and excel- 

 lence of its working problems, on which in this subject preemi- 

 nently the student's effective knowledge of the science must 

 depend. The revised edition is enriched by considerable additions 

 to the problems and by a portrait of Leibnitz. The changes in 

 the text are unimportant. w. b. 



4. The Theory and Practice of Technical 'Writing; by Samuel 

 C. Earle. Pp. vii, 301, with numerous figures. New York, 

 1911 (The Macmillan Company). — This work is of somewhat 

 novel character, since it is planned to guide the engineer in his 

 task of presenting his reports in a manner that shall be at once 

 clear and effective. It has been assumed too much, hitherto, that 

 technical writing would take care of itself, and hardly required 

 the same care as discussions more general and literary in their 

 character. The author discusses with much clearness the various 

 principles of logical structure, and then the practical application 

 of these to the cases in hand, which may be treated in different 

 form, according to the audience for which they are prepared. 

 The Appendix gives a series of useful illustrative examples. 



5. Publications of the Harvard College Observatory ; Edward 

 C. Pickering, Director.— Recent publications are noted in the 

 following list (continued from vol. xxxii, p. 327) : 



Annals. — Vol. LXII, Part II. Ledger of Zone Observations 

 made with the 8-inch Meridian Circle during the years 1888-1898; 

 by Arthur Searle. Pp. 149-253. 



Yol. LXXI, No. 2. Spectra and Photographic Magnitudes 

 of Stars in Standard Regions ; by Williamina P. Fleming. 

 Pp. 27-45. 



Circulars. — No. 167. Stars Having Peculiar Spectra. 31 New 

 Variable Stars. Edward C. Pickering. Pp. 3 ; 2 tables. 



No. 169. Photometric Observations of Asteriods. Pp. 4 ; 

 1 figure. 



6. Publications of the Allegheny Observatory of the Univer- 

 sity of Pittsburgh. — The following have recently been issued ; 

 Vol. II, No. 14. The Spectrum and Orbit of ft Scorpii, by Zac- 

 cheus Daniel and Frank Schlesinger. Pp. 127-137. 



A simple method for adjusting the Polar Axis of an Equato- 

 rial Telescope ; by Frank Schlesinger (Popular Astronomy, 

 1911). 



