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-160. 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., U. S. A. 



The American Journal of Science 



Contributors are requested to revise their manuscript with special care with 

 reference to the use of the linotype machine ; changes involving overrunning are 

 expensive. In general, the publisher cannot undertake to assume the cost of more 

 than minor corrections in the proof. All corrections should preferably be made in 

 ink. 



Foot notes should be numbered consecutively from 1 up. 



The following is an example of the system of references employed, the volume being 

 given in heavy faced type : 



Am. J. Sci., 44, 249, 1917. The year should be given in every case ; this renders a 

 series number unessential. 



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 ; see schedule below. 



No. Copies. 



50 



100 



200 



300 



500 



8 pasres 



$2.25 

 3.50 

 4.75 



$2.15 

 4.25 

 5.75 



$3.50 

 5.25 

 7.00 



$4.25 

 6.25 

 8.25 



$5.50 



8.00 



10.50 



16 *' 



24 " 





Cover 



$1.00 



$1.25 



$1.75 



$2.25 



$3.00 



During the paper famine the above prices may be increased from 5 to 10 per cent. 



