. Birds of the Boston Public Garden : a study in migration . r of thedomain at that time. So it would seem asif the species made no gain in numberswithin the Garden for a period of twentyyears. In 1902 the number had doubledthat of 1901, but there were then only fourpairs. In 1903 the number had more thandoubled again, and the record shows tenpairs nesting. In 1904 there were fourteennests; in 1905 eighteen nests; in 1906 thirty-two nests. The year 1907 marked a dim-inution of pairs, as the number of nestsobserved was but twenty-five, and in 1908about the same number was recorded. Thisdiminuti
. Birds of the Boston Public Garden : a study in migration . r of thedomain at that time. So it would seem asif the species made no gain in numberswithin the Garden for a period of twentyyears. In 1902 the number had doubledthat of 1901, but there were then only fourpairs. In 1903 the number had more thandoubled again, and the record shows tenpairs nesting. In 1904 there were fourteennests; in 1905 eighteen nests; in 1906 thirty-two nests. The year 1907 marked a dim-inution of pairs, as the number of nestsobserved was but twenty-five, and in 1908about the same number was recorded. Thisdiminution may have been due in part to asevere pruning of the English hawthorns,which left them no longer the thick treescoveted for nesting which they had consequence was that some pairs re-sorted to the tops of the tallest deciduoustrees for nesting-sites, and doubtless therewere not favorable places enough for asmany as the numbers of 1906. Some of thesurplus passed over to the Common, forthere was an increase in the number ofpairs which nested BRONZED CRACKLE 95 In five years, therefore, from 1902 to1906, there was a rapid increase of gracklesbreeding within the Garden, and such acheck as occurred in 1907 was doubtlessdesirable. The earhest arrival of the species was onMarch 11, 1906, when two birds speared;but this earliness of date was ofiFset by theirdisappearance after six days, owing to aweek of wintry weather, in which the mer-cury dropped to 11° and two sno^-falls oc-curred, depositing fifteen inches of was a reappearance of these twobirds, or other two, on ]\Iarch 25, followedby successive additions until the numberof nesting birds reached sixt\-four. Thenext earliest arrival was in 1908, when threebirds appeared on March 12. The latestdate of arrival of the species within theGarden was March 24, in 1904. The usualtime of coming has been bet^een March 16and 18. ^ A male Bronzed Crackle, which had returned to theCarden for the season of 1909, wa
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