/<fO 6 '?-^ 



SCIENCE 



New Series. 

 Vol. VII. No. 169. 



Friday, March 25, 



Single Copies, 15 cts. 

 Annual Suesceiption, $5.00. 



RXSCSNT PUBIiilGA'TIOWS. 



Spectrum Analysis. 



By John Landauer. Authorized Englisli Edi- 

 tion by J. Bisbop Tingle, Instructor of Cbeniistry 

 in tbe Lewis Institute, Chicago. 8vo, cloth, $3.00. 



A Handbook for Chemists of Beet=Sugar 

 Houses and Seed=Culture Farms. By 



Gtjilfoed L. Spencer. 12mo, moro co, $3.00. 



The Calorific Power of Fuels. 



(Founded on Scbeurer-Kestner's Pouvoir Calorifi- 

 que des Combustibles. ) To which is added the 

 Report of the Committee on Boiler Tests of the 

 American Society of Mechanical Engineers (De- 

 cember, 1897). By Herman Poole, F.C.S. iWiih 

 many Tables.) 8vo, cloth, $3.00. 



Quantitative Chemical Analysis by Elec- 

 trolysis. 



According to Original Methods, by Dr. Alexan- 

 der Classen, of the Royal School of Technology 

 at Aachen. Authorized translation from the fourth 

 revised and enlarged German edited by Wm. Hale 

 Herrick and B. B. Boltwood. 8vo, cloth. $3.00. 



Higher Structures. 



Part IV. A Text-book on Roofs and Bridges. 

 By Professors Meeriman ' and JACOBY. First 

 Edition, Octavo, Cloth, Price $2.50. 



American Railway Management. 



By Henry S. Haines. 373 pages. 12mo, Cloth, 

 $2.50. 



Living Plants and Tlieir Properties. 



Order througJi your bookseller, or copies forwarded by the publishers on receipt of the retail price. 



JOHN WILEY & SONS, 53 E. 10th St., New York City. 



By Professir J. C. ARTHUR, Purdue University, and Pro- 

 fessor D. T. MacDOUGAL, University of Minnesota. A 

 timely book of 12 independent chapters, viz: The special 

 senses of plants, development of irritability, universality of consciousness and pain, compass plants, sensitive plants, oppos- 

 ing factors of increase, influence oi cold, significance of color, chlorophyll and growth, history of leaves, the right to live, 

 and comparisons between plants and animals. The subjects included are treated from new points of view with original 

 illustrations. The language is non-technical, and the book will be of interest to the general reader as well as to the biologist . 



Printed on enamelled paper with marginal sub-titles, 30 illustra'ions, 210 pp., 8vo, bound in cloth. Price, $1.25 ppd. 

 BAKER & TAYLOR, MORRIS & WILSON, 



5 AND 7 EAsr 16th St.. New Y ork. Mimheapolis. Mihw. 



JUST PUBLISHED. 



FACTS ABOUT BOOKWORMS, 



THEIR HISTORY IN LITERATURE AND WORK IN LIBRARIES. 



By J. F. X. O'CONOR, S.J., with Entomological Notes by the late Prof. C. V. Riley, of the U. S. Ento- 

 mological Commission. Illustrated. 12mo, Cloth, Gilt Top. $2.00, nftt. 

 Only T50 copies handsomely printed at tlie GUUs press, rubicated title pages, and initial letters. 



The author, as librarian of several large libraries, has had unusual facilities for making a life study of these destructive 

 little creatures. Although written in a popular manner in which the antiquarian predominates, still his suggestions about 

 the care of books, how the 72 varieties of paper-eating insects, which he has examined under the microscope, may be 

 guarded against and destroyed when found, make it of value to all who love or have the care of books. 



Sent postpaid on receipt of price. 



FRANCIS P. HARPER, Publisber, 

 17 East i6tli Street, New York City. 



