VUl 



SCIENCE-ADVERTISEMENTS 



Just "Published 



BY 



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



PROFESSOR OF PALAEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



Large Octavo. 1150 pages, with 264 Hlustratious In the text. 

 Cloth bound, price, S7. 50. 



Send for descriptive circula 



A. G. SEILER & CO. 



PUBLISHERS 

 1224 Amsterdam Avenue NEW YORK, N. Y. 



HEREDITY AND SEX 



By THOMAS HUNT MORGAN,£Ph.D. 



Professor of Experimental Zoology, Columbia University 



12ino, cloth, pp. ix. + 282. Illustrated.j 

 Price, $1.75 net; by mail, 31.90. 



COLUMBIA UNIVERSITY PRESS 



Lemcke and Buechner, Agents 



30-32 West 27th Street NEW YORK CITY 



MARINE BIOLOGICAL LABORATORY 



VVOOOS HOLE, iWASS. 

 Biuiog:lcal Material 



1. Zoology. Preserved mavcru.l of all types of animalB 

 for class work and for the museum. 



2. Embryology. Stages of some invertebrates, fishes (in- 

 cluding Acanthias, Amia and Lepidosteus), Amphibia, and 

 some mammals. 



3. Botany. Preserved material of Algae, Fungi, liver- 

 worts, and Mosses. Price lists furnished on application to 

 GEORQB M. GRAY, Curator, Woods Hole, Mass. 



ELEVENTH EDJTION 



THB A^ICROSOOPE, 



Bn introduction to Microscopic Methods and to Histology, by 

 Simon Henry Gage of Cornell University. The 11th edition 

 has eight pages of new matter and corrections, otherwise it is 

 like the 10th ed. Price $2.00 postpaid. 

 COMSTOCK PUBLISHING CO., Ithaca, N. Yo 



Batteries 



J^^.-m'Tx-.-rr- 



By special arrangement veith the factory, we 

 act as college sales agents for the 



"Exide" Batteries 



These may be furnished in stationary or port- 

 able form, with any number of cells desired, 

 and with a current of from i ampere up to any 

 maximum desired. As they deliver a steady 

 current and potential, they will be found very 

 useful for laboratory work. The portable 

 forms are provided with a neat wooden carry- 

 ing case. 



For full particulars, write for Catalog 766. 



JAMES G. BIDDLE 



1211-13 Arch Street 

 PHILADELPHIA 



When in Philadelphia be sure to visit our Permanent 

 Exhibit of Scientific Instruments. 



