SCIENCE-ADVERTISEMENTS 



Spencer 



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. 



$75.00 



A Limited Number of 810 and 820 ready 

 for shipment 



SPENCER LENS COMPANY 



BUFFALO, N. Y. 



Marine Biological Laboratory 



Woods Hole, Mass. 



INVESTIGATION 



Eatlr* Yeu 



INSTRUCTION 



July 3 to August 13 



SUPPLY 

 DEPARTMENT 



Opan the Entli* Year 



Fs<nlitieB for research In Zoology, 

 Embryology, Phymology and Bot- 

 any. Seventy-flix private labora- 

 toriea, tlOO each for not over three 

 months. Thirty tables are avail- 

 able for beginners in research who 

 desire to work nnder the direction 

 of members of the staff. The fea 

 for such a table is tSO.OO 



Courses of laboratory instraotioB 

 with lectures are oSered 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 Sciences is also offered. 



inlmals and plants, preseired, Uv- 

 ing, and in embryonis stage*. 

 Preserved material of all ^ypea of 

 anhnals and of Algae, Fungi, Liver- 

 woTta and Mosses furnuhed for 

 elaaswork, or for the museum, 

 living material furnished in season 

 ■■ ordered. Price lists of Zoological 

 uid Botanical material sent on ap- 



SUoatios. State which is de^red. 

 'or prioe lists and all information 

 recardrng material, addrest 



OBO. M. QBAT, Coiator. Woods Eels, MaM. 



Th« umaal anBaanssmeat will be sea I oa appUcatioa to The 

 DiNotar, Marine Biologieal Laboratory, Woods Hola, Ma«. 



Cooking Class at the 

 Soutli Dakota State College 



are using gas made by 



The "Detroit" 

 Combination Gas Machine 



for supplying gas in Departments of 



Domestic Science 

 Chemistry and Physics 



(Over 30,000 in dail^ me) 



Laboratory work can be done better, 

 quicker and cheaper by using this gas. 

 Ask for descriptive catalog and names 

 of users in your vicinity. 



Detroit Heating & Lightbg Co. 



612 Wight St. Detroit, Mich. 



Eit. 1868 



