The Method for Ornithophaenology Inauguarated By the Hungarian Central Office of
The Method for Ornithophaenology Inauguarated By the Hungarian Central Office of
Ott Herman
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2 nd March For Europe the earliest arrival was : Murcia, 380' N. L 15 th February Italy, mean date ace. To GIGLIOLIS' indications . 14 th March Germany, mean date out of means .... 16 th 17 th April England, mean date 24 th 25 th April Lulea, mean date based on records of 21 years . 26- 27 May Western Finland, ace. To Middendorff. . . . 11 th June** From the acceptable data Murcia-Lulea it follows that the chimney-swallow needs on an average 92 days to settle in this area, * 1 whereas, consider...ing the velocity of her flight - - from 20, to 65 metres a second - - she should require less than 92 hours to cover this distance : a direct proof that the progression is dependent upon another factor, viz. The course of the isotherms, as HEGYFOKY later * Vide O. Herman:, Die Klemente des Vogelzuges in Ungarn etc. 1895". *" For the whole series see, Aquila" I. 1894. P. 1219. *** Rectified ultimately on the base of the observations of Gibraltar to 105 days; vide, Recensio" p. 21. 9 on proved ; consequently we may say that the chimney-swallow on her spring journey from South to North travels so to say with the spring.
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