. Bird lore . nsylvaina Dr. Frederick A. Lucas, New York Dr. Herman C. Bumpus, New York Mr. Carlton D. Howe, Vermont Class of 1913 Mrs. C. Grant LaFarge, New York Dr. Jonathan Dwight, Jr., New York Dr. Theo. S. Palmer, District of Columbia. The Wilson Bulletin It a quarterly journal devoted tothe study of the birds as we findthem in the fields and woods. It is particularly concerned about the studyof the whole life-history of each species,and about the effects of advancing civiliza-tion upon the lives of all birds. It urgesthe great importance of making a censusof our bird population for the p
. Bird lore . nsylvaina Dr. Frederick A. Lucas, New York Dr. Herman C. Bumpus, New York Mr. Carlton D. Howe, Vermont Class of 1913 Mrs. C. Grant LaFarge, New York Dr. Jonathan Dwight, Jr., New York Dr. Theo. S. Palmer, District of Columbia. The Wilson Bulletin It a quarterly journal devoted tothe study of the birds as we findthem in the fields and woods. It is particularly concerned about the studyof the whole life-history of each species,and about the effects of advancing civiliza-tion upon the lives of all birds. It urgesthe great importance of making a censusof our bird population for the purposeof determining accurately what changethere may be in numbers due to changingconditions. It is the official organ of theWilson Ornithological Club, which num-bers among its members some of themost prominent American selected illustrations appear ineach number. IS cents a number; 50 cents a year Address LYNDS JONES, Editor, Oberlin, Ohio. Perfection Bird Houses FOR THE PurpleMartin. We build went y-f i veyears experiencein the study ofthese fine birds,and success in their colonization, hastaught us the exact requirements ofthe House Martins and enables us toconstruct ideal boxes for their use. Illustrated Booklet 10 cents The J. Warren Jacobs Bird House , PA. DEOPLE talk about aLens as if it were anordinary thing—und vetwhen one stops to think howscientists and mechanicianshave thought and worked toevolve the peculiar qualitiesof excellence of the Bausch & Lomb-Zeiss New Tessar he. gets some notion of nowreally great and .importanta thing the lens is. Inj critical ^photographicwork the New Tessa? is thenewest and fastest of theTessar series and it is trulya marvel. Send for circulars illustrat-ing Tessar lenses. PRISM is/a little maga-zine of lens for copy. OUR NAME OS A PHOTOGRAPHIC GLASS. M ICROSCOPE. LABOR ATORYAPPARATUS. SCIENTIFIC OR ENGINEERINGINSTRUMENT IS OUR GUARANTEE. Bausctj &?omb Optical
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