SCIENCE-ADVERTISEMENTS 



Handy 

 Resistance Units 



These are furnished in single value blocks, 

 ranging from o.l ohm to 10,000 ohms. 

 Blocks for all values are uniform in size, 

 and can readily be arranged in groups to 

 build up any desired resistance. Adjust- 

 ment is made to 1/20 of one per cent. 



We have just issued a new Circular (No. 

 10), describing and listing these units. 

 Write for it. 



Circular No. 10 also describes a new two- 

 value Unit, especidly designed for teach- 

 ing purposes, to check up students on 

 resistance measurements. 



Pyrolectric instrument CO. 



Pyrometric aod Electrical PredsioD Instruments 



636 EAST STATE STREET TRENTON, N. J. 



E. F. Nortlirup, President and Technical Adviser 



Some Notable Blakiston 

 Books 



JOHNSTON— Nervous System of the 

 Vertebrates $3.00 



KINGSLEY— Comparative Anatomy of 

 the Vertebrates 2.50 



SANTEE— Anatomy of the Brain and 

 Spinal Cord 4.50 



SUTTON and DRINKER— Osteology 

 and Syndesmology 1.50 



MARSHALL — Microbiology. General 

 and Applied 3.00 



BENSLEY — Practical Anatomy of the 

 Rabbit 2.50 



DAVISON— Mammalian Anatomy 1.50 



FOLSOM— Entomology 2.50 



GALLOWAY — Zoology 1.50 



PATTEN— Evolution of the Vertebrates 

 and Their Kin 4.50 



HARSHBERGER— Textbook of Myco- 

 logy, Plant Pathology 3.00 



PALLADIN— Textbook of Plant Phys- 

 iology 3.00 



ROBBINS— Botany of Crop Plants . . . .2.50 



P. BLAKISTON'S SON & CO. 



PHILADELPHIA 



The University of California Press 



Berkeley, California 280 Sladlson Avenue, New Tork 



THE GAME BIRDS OF 

 CALIFORNIA 



By J. Grinnell, H. C. Bryant and 

 T. t. Storer 



Large 8vo, pp. x+642, 16 colored plates, (14 figures in 

 text. Cloth, $6.00 {carriage extra, weight 4 lbs. 6 oz.) 



A detailed descriptioii of every one of the 108 native 

 game birds of the state, comprising a practically com- 

 plete summary of our knowledge of each up to the 

 present time. 



The plan of treatment of each bird follows a regular 

 sequence: Technical portion (in small type): Accepted 

 common and scientific names; other names; descrip- 

 tion; adult male, adult female, juvenile, downy young; 

 marks for field identification; voice; nest; eggs; gen- 

 eral distribution; distribution in California. Text (in 

 large type): General and'local distribution; migration; 

 field marks; life history: nest, eggs, young; habits and 

 behavior; food; econon;iic value; present and probable 

 future status. 



Complete lists of titles and prices of all publications 

 of the University of California Press will be sent on 

 request. 



GAS-GAS 



The "Detroit" 

 Combination Gas Machine 



Automatically meikes the best 

 and cheapest gas for 



Laboratory Uses of Every Character - 



Heating — Coolcing — Lighting 

 Over 30,000 in daily use 



rtpttoe catalogue t 

 locality . 



request 



The Detroit heating & 



LIGHTING Co. 



612 Wight St. Detroit, Mich. 



Established 1868 



