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 CONTENTS Young Barn Owls ............................. Photo by//. T. Bohhnan Frontispiece The Barn Owl and its Economic Value .......................................... .............................. ltz. L. Finley (5 photos by H. T. IBohlman) 83 The Percentage of Error in Bird Migration Records ................ [/ilmer Stone 88 Land Birds of San Onofre, California ............................. Joseph Dixon 9 ! Notes on Birds Observed while Traveling from Yokohama to Manila (with one line cut) .............................................. Richard C. 2;[cGrego' 98 ' 'Atratus versus Megalonyx". .................................. Robert Ridgway IOO NOTES AND NEXVS ........................................................ xoI Directory of Cooper Club Members ............................................. IOi Entered as second-class matter May 4, I9O6, at the post office at Pasadena, California, under Act of Congress of March 3, 1879. Issted from The Office of The Cottdor, 871 No. I,ake Ave., Paadeaa, Cal. It0ys and Girls Ma_ainc A Nature PIalazine For Home and School ]eautifull Illustrated Contains Live, Interesting Nature Stories. FIF'I'Y CEN'I' A Send for sample copy Address, !0ys and Girls P4aazine ITHACA, NT. r. Camp Agassiz At Glen ,lpinc, above Lake Tahoe, Cal. In the Lake Tahoe Forest Reserve Is the key to a region unequalled for fishig and natural history pursuits. Ninth season. For beantiful booklet address the directors: W. W. Price, or Walter K. Fisher, Tallac, Lake Tahoe, Cal When replying to advertisements please mettion THI, CONDOR