<)/<) by L. F. Brehi. 



Nest of Wilson's Thrush 



This illustration shows the 

 advantage of the single combi- 

 nation of the 



Bausch & Lomb-Zeiss 

 Protar, Series Vila 



which is a convertible lens, and 

 hence valuable for outdoor pho- 

 tography, and yet can also be 

 advantageously used indoors. 



The Protar is a doublet of 

 moderate focal length, composed 

 of two long focus single lenses. 



The correction of these lenses 

 is so excellent 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 nani^i backed by over half a 

 ^S5hso:^ century of experience, is on 

 (i(^^^^ ^11 otir products — lenses, 

 ^^^/J^J microscopes, field-glasses, 

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Bausch ^ Ipmb Optical (p. 



NEW YOUK WASHINCTOM CHICAGO SAN rKANClSCO 



uoNDON aoCH ESTER.. N.Y. '■rankfort 



The Condor 



A MAGAZINE, OF WE,STE,RN 

 ORNITHOLOGY 



Edited by J. Qrinncll 



Associate £.ditors: 



H. S. Swarth, Robert B. Rockwell 



Official Organ of the Cooper Ornitholotical 

 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, $1.50 

 per year net in advance. Single 

 copies, 30 cents each. Foreign sub- 

 scription, $1.75. 



W. Lee 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, Neets, Eggs. 

 The only medium of ex- 

 change between those inter- 

 ested in these. 



NOW IN ITS TWENTY-SEVENTH YEAR 

 SUBSCRIPTION, 50 CENTS PER YEAR 



