SCIENCE-ADVERTISEMENTS 



Spencer Rotary Microtome No. 810 



A simplified microtome with feed 

 mechanism absolutely independent 

 of the up-and-down movement of the 

 object. This is accomplished by fol- 

 lowing the same principle of con- 

 struction which has won for Spencer 

 Rotary Microtome No. 820 an Inter- 

 national reputation for precision and 

 accuracy. 



A Limited Number of 810 and 820 ready 

 for shipment 



SPENCER LENS COMPANY 



BUFFALO, N. Y. 



Marine Biological Laboratory 



Woods Hole, Mass. 



INVESTIGATION 



INSTRUCTION 



July 3 to AusuEt 13 

 1918 



SUPPLY 

 DEPARTMENT 



Open tha Entir* Year 



Facilities for research in Zooloa^, 

 Embryology, PhysioloEy and Bot- 

 'any. Seventy-six private labora- 

 tories. $100 each for not over three 

 months. Thirty tables are avail- 

 able for beginners in research who 

 desire to work under the direction 

 of members of the staff. The fee 

 for such a table is $50.00 



Courses of laboratory instruction 

 with lectures are offered in Inverte- 

 brate Zoology, Embryology, Physi- 

 ology and Morphology and Taxo- 

 nomy of the Algae. Each course 

 requires the full time of the student. 

 Fee, $50. A lecture course on the 

 Philosophical Aspects of Biology 

 and Allied Scionces is also offered. 



Animals and plants, preserved, liv- 

 ing, and in embryonic stages. 

 Preserved material of all typea of 

 animals and of Algae, Fungi, Liver- 

 worts and Mosses furnished for 

 olassworlt, or for the museum. 

 Living materia] furnished in season 

 as ordered. Price lists of Zoological 

 and Botanical material sent on ap- 



fUcation. State which is dearcd. 

 or price Eats and all information 

 regardinf material, address 



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

 ThM aimaal announcement will be sen « on application to The 

 Director, Marine Biological Laboratory, Woods Hols, Maa. 



FOR SALE 



Offers invited for the following: 



American Chemical Journal, Vols. 1-18 inclusive, 1879-96. 

 Unbound. 



Journal of Chemical Society, London, 1879-99 inclusive. (Oct., 

 Nov., Dec. numbers, and index 1883 missing.) Unbound. 



Journal of the Philadelphia College of Pharmacy, Vols. 1-24 

 inclusive, 1829-52. Half morocco. And its successor, 

 The American Journal of Pharmacy, Vols. 1-18 inclusive, 

 1853-70. Half morocco. Vols. 1-9 inclusive, 1871-79. 

 Half morocco. Vols. 52-83 inclusive, 1880-1911. Un- 

 bound. 



Handbook of Chemistry, Gmelin. English translation for 

 Cavendish Society, 18 vols, complete and one vol. index. 

 London, 1848. Cloth. 



U. S. Geolog. Survey of Territories, Vol. 5. Cretaceous Flora. 

 Lesquereux. 1874. 



U. S. Geolog. Sur\'-ey of Territories, Vol. 7- Tertiary Flora. 

 Lesquereux. 1878. 



U. S. Geolog. Survey of Territories West of 100 Meridian, Vol. 

 4. White and Cope. 1S77. 



U. S. Geolog. Survey, Vol. 12. Fresh Water Rhizopoda. 

 Leidy. 1879. 



U. S. Geolog. Survey, Vol. 2. Cretaceous Vertebrata. Cope. 

 1875. 



Geolog. Siu^ey of Ohio, Vol. 1. Paleontology. Meek. 1873. 



Reports of the Geology, Botany and Zoology of Northern Cali- 

 fornia and Oregon. U. S. War Dept. J. S. Newberry. 

 1857. 



Reports on the Explorations and Surveys, Mississippi River to 

 the Pacific Ocean to ascertain the most practicable route 

 for a Railway, Vol. 9, Part 2. Birds, by Spencer F. Baird. 

 1853-56. Published by U. S. War Dept. 1858. 



Address 



R. H., THE SCIENCE PRESS, Lancaster, Pa. 



