SCIENCE-ADVERTISEMENTS 



The Present Tendency 



in teaching the various sciences is to give the 

 pnpil a sensible idea of the manner in which 

 fundamental principles of nature affect our 

 everyday life. 



This is true of chemistry quite as much as 

 of any other science, but the average person does 

 not begin to realize how useful this study may 

 be made. To any one familiar with Weed's 

 Chemistry in the Home — one of our new books 

 — this is clearly apparent. 



To enlighten teachers who are not familiar 

 with this book we have just issued a little 

 pamphlet, No. 1552, containing 100 Practical 

 Chemistry Questions About the Home, which 

 can be answered by any boy or girl who has 

 studied this chemistry. The author of the 

 book is H. T. Weed, Head of Science Depart- 

 ment, Manual Training High School, Brooklyn. 



If you would like a copy of this illumina- 

 ting pamphlet drop us a line and we will 

 gladly send you one. 



AMERICAN BOOK COMPANY 



New York Cincinnati Chicago 



Revised 

 Edition 



A Course in Invertebrate 

 Zoology 



By Henry Sheering Pratt, Professor 

 of Biology in Harvard College, and In- 

 structor in Comparative Anatomy in the 

 Marine Biological Laboratory, Cold 

 Spring Harbor, Long Island. 



WIDELY used in the earlier edition, 

 this zoology will be even more popu- 

 lar because of the inclusion of new dis- 

 sections and an improved system of classi- 

 fication. The large number of dissections 

 enables the teacher to select those best 

 adapted to his needs. New features are 

 directions for the dissection and compara- 

 tive study of the house fly, a spider, the 

 oyster, a holothurian, a jellyfish, and a 



sea anemone 228 pages, $1.25 



A Course in Vertebrate Zoology, 229 

 ..50. By Henry Sherring Pratt. 



Ginn and Company 



Boston New York Chicago 



London Atlanta Dallas 



Columbus San Francisco 



New York Academy of 

 Sciences 



(Founded in 1817 as the Lyceum of Natural 

 History of New York} 



Publications 



AnnalB. Begun in 1824. Published in brochures at irregular 

 intervals, one octavo volume of 300 to 500 pages per calendar 

 year with illustrations. Price $3.00 per volume. The price* 

 of separate brochures may be learned on application. 



Recent Articles 



Elvira Wood : The Use of Crinoid Arms In Studies of 



Phylogeny 80.35 



Henryk Arctowski : A Study of the Changes in the 

 Distribution of Temperature in Europe and North 

 America during the Years 1900 to 1909 76 



G. G. Scott: A Physiological Study of the Changes in 

 Mustdus canis produced by Modifications in the 

 Molecular Concentration of the External Medium .75 



Ferdinand Friis Hintze, Jr.: A Contribution to the 



Geology of the Wasatch Mountains, Utah 80 



Charles Reinhard Fettke : The Manhattan Schist 

 of Southeastern New York State and Its Associ- 

 ated Igneous Rocks 96 



ADDRESS 



New York Academy of Sciences 



care of 



American Museum of Natural History 

 New York, N. Y. 



SenJ for descriptive circulars and sample 

 pages 



PRINCIPLES OF 



STRATIGRAPHY 



BY 



AMADEUS W. GRABAU, S.M., S.D. 



PROFESSOR OF PALAEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



Large Octavo, 1150 pages, with 254 illustrations in the text. 

 Cloth bound, price, $7.50. 



Send for descriptive circular 



A. G. SELLER & CO. 



PUBLISHERS 

 1224 Amsterdam Avenue NEW YORK. N. Y. 



