Bausch & Lomb- 

 Zeiss 



PROTAR SERIES Vila 



is a convertible lens, and 

 hence valuable for outdoor 

 photography, and yet it can 

 also be advantageously used 

 indoors. 



The Protar is a doublet 

 of moderate focal length, 

 composed of two long-focus 

 single lenses. The correc- 

 tion of these lenses is so ex- 

 cellent that the single lenses, 

 as well as the doublet, give 

 most satisfactory results. 



Thus one has really three- 

 lenses-in-one. 



Descriptive Circular sent 

 on request. 



Our name, backed by over half a 

 /^^^\ century of experience, is on 

 (ff^^^^'^m all our products — lenses, 

 \^>^S^yiJ microscopes, field-glasses, 

 ^^i-^i^ projection apparatus, engi- 

 neering and other scientific instruments. 



Bausch ^ Ipmb Optical (p. 



"" ''°o''NDo'^"[{oCH°ESTE'[i."N.Y. rRrNKrORT 



The Condor 



A MAGAZINE- OF WE.STE,RN 

 ORNITHOLOGY 



Edited by J. Grinncll 



Associate Lditors: 

 H. S. Swarth, Robert B. Rockwell 



Official Organ of the Cooper Ornithological 

 Club 



Vol. XIII, 1911 



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, f 1.50 

 per year net in advance. Single 

 copies, 30 cents each. Foreign sub- 

 scription, $1.75. 



W. Lcc Chambers, Business Manager 



R. r. D. No, 1, Box 73-D 



Los Angeles, Calif. 



The OOLOGIST 



Has been purchased and is 

 now published by 



R. MAGOON BARNES, Lacon, 111. 



New Methods; New Blood. 

 An illustrated monthly, de- 

 voted to Birds, Nests, Eggs. 

 The only medium of ex- 

 change between those inter- 

 ested in these. 



NOW IN ITS TWENTY-SEVENTH YEAR 

 SUBSCRIPTION, 50 CENTS PER YEAR 



