iv 



SCIENCE.— ADVERTISEMENTS. 



MARINE BIOLOGICAL LABORATORY 



Sapply Department — 1. Zoology — Preserved Material 



of all types of animals for class work or for the museum. 

 2. Botany — Preserved Material of Algae, Fungi, Liver- 

 worts and Mosses. For price lists and all information ad- 

 dress GEO. M. GRAY, Curator Woods Holl, Maps. 



The Rochlitz Automatic 



LL 



WATER STI 



works day and night without at- 

 tention, and gives absolutely pure 

 and sterile distilled water at the 

 rate of half a gallon per hour. It is 

 especially adapted to hospital and 

 home use. Illustrated descriptive 

 circular sent post free. 



THE SCIENTIFIC SHOP, 

 322 Dearborn Street, Chicago. 



We shall esteem it a favor if you will ask 

 your bookseller to show you 



Macmillan's Popular Series 



of 25-cent Novels 



including the best modern fiction, books by Mrs. Humphrey 

 Ward, Owen Wister, Winston Churchill and others. 



Price, 25 cenlx. Piibli's/ieil f/i/ The Mucinilliin Conipiiinj 



WM. GAERTNER &; CO. 



Astronomical and 

 Physical Apparatus 

 5347 and 5349 LAKE AVE ., :: :: CHICAGO 



SPECIALTIES 

 Standard Apparatus of New and Improved Designs 

 Reading Microscopes and Telescopes 

 Astronomical Telescopes Dividing Engines 



Spectroscopes Comparators 

 Michelson Interferometers General Laboratory Apparatus 



Bolometers Hellostats Universal Laboratory Supports 



NEW LABORATORY AND STUDENT'S BALANCE 

 LarKe Capacity High Accuracy 



Greatest Convenience Low Cost 



The 



Man Who Knows 



the good and the bad points 

 of all 



Typewriters 



buys the 



Remington 



Remington Typewriter Co. 



New York and Everywhere 



