Perfection Bird Houses 

 for the Purple Martin 



We build them. Twenty-five years' experience 

 in the study of these fine birds, and success in 

 their colonization, has taught us the exact re- 

 quirements of the House Martins and enables 

 us to construct ideal boxes for their use. 



Illustrated booklet 10 cents 



THE JACOBS BIRD HOUSE CO. 

 WAYNESBURG. PA. 



The Condor 



A MAGAZINE, OF WtSTLRN 

 ORNITHOLOGY 



Edited by J. Qrinnell 



Associate editors: 

 William L. Finley, Robert B. Rockwell 



Official Organ of the Cooper Ornithological 

 Club 



Vol. XI, 1909 



will contain the usual interesting ar- 

 ticles by live, active ornithologists 

 and will be illustrated by the highest 

 class of half-tones. You cannot 

 afford to miss a number. 



Published bi-monthly at Holly- 

 wood, California. Subscription, $1.50 

 per year net in advance. Single 

 copies, 30 cents each. Foreign sub- 

 scription, I1.7S. 



J. Lugene Law, Business Manager 



Hollywood, California 



W. Lee Chambers, Assistant Manager 



Santa Monica, California 



Bausch&Lomb 



New 



Compound 



Shutter 



places at the command of hand 

 camera users an ally of the 

 speed lens. 



An automatic and setting shut- 

 ter combined, it permits both 

 bulb and time exposures to be 

 made automatically, while speeds 

 of from I second to 1-250 sec- 

 ond can be given automatically 

 when the shutter is set. 



The mechanism is precise and 

 accurate and little liable to de- 

 rangement. 



Light in weight and hand- 

 some in appearance. 



Send for descriptive circular. 



Prism is a little popular science 

 monthly. Send for copy H, free 

 upon request. 



x^^Sma^^ Our Name on a Photographic Lens, 

 ■^/'™Nv\ Tlicroscope. Tield Glass, Labora- 

 tory Apparatus, T-ngineering or 

 any other Scientific Instrument is 



i^iA-^i'Sy gj^y Guarantee. 



Bausch Xi Ipnib Optical (p. 



