The Method for Ornithophaenology Inauguarated By the Hungarian Central Office of

Cover 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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