Ward's Natural Science Establishment 



A Supply-House for Scientific Material. 



Founded 1862. Incorporated 1890. 



A few of our recent circulars in the various 

 departments : 



Geology: J-3. Genetic Collection of Rocks and Rock- 

 forming Minerals. J-148. Price List of Rocks. 



Mineralogy: J-109 Blowpipe Collections. J-74. Meteor- 

 ites, J-150. Collections. J-1G0. Fine specimens. 



Paleontology: J-134. Complete Trilobites. J-115. Collec- 

 tions.. J-140. Restorations of Extinct Arthropods. 



Entomology: J-30. Supplies. J-125. Life Histories. 

 J-128. Live Pupae. 



Zoology: J-116. Material for Dissection. J-26. Compara- 

 tive Osteology. J-94. Casts of Reptiles, etc. 



Microscope Slides: J-135. Bacteria Slides. 



Taxidermy: J-138. Bird Skins. J-139. Mammal Skins. 



Human Anatomy: J-16. Skeletons and Models. 



General: J- 155. List of Catalogues and Circulars. 



Ward's Natural Science Establishment 



84-102 College Ave., Rochester, N. Y., IT. S. A. 



The American Journal of Science 



Established by Benjamin Silliman in 1818. 



Contributors should send their articles two months before the time of issuing 

 the number for which they are intended. The title of communications and the 

 names of authors must be fully given. Notice is always to be given when com- 

 munications offered have been, or are to be, published also in other Journals. 



Thirty separate copies of each article will be furnished-to the author free of 

 cost and without previous notice from him. They will be provided with a plain 

 cover (but with reference to volume and year). If the author orders separate 

 copies, they will be understood to be in addition to the thirty mentioned above, and 

 he will receive a bill for the extra expense involved, as also for that of a printed 

 cover (with title, etc.), when this is specially ordered. These charges will conform 

 to the following schedule ; but will be increased if there are plates. 



No. Copies. 



60 



100 



200 



300 



500 



8 pages 



$2.25 

 3.50 

 4.75 



$2.75 

 4.25 

 5.75 



$3.50 

 5 25 



7.00 



$L25 

 6.25 

 8.25 



$5.50 



8.00 



10.50 



16 " 



24 " 





Cover _. 



$1.00 



$1.25 



$1.75 



$2.25 



$3.00 





ft^T" During the Paper Famiae the above prices may be somewhat increased 

 (e. g., from 5 to 10 p. c). 



