6 



Aprilis 8, N.-Enyed . . 1848, Aprilis 13. Zilah .... 1882, 



9. Fogaras . . . 1886, 13. Pozsony . . -. 1889, 



10. Rozsnyo . . . 1867, ,, 13. Sz.-Bela ." . . 1881, 



10. Koszeg . . . 1887, ., 14. Kolozsvar . . 1881, 



10. Budapest . . 1879, 16. Chymes . . . 1878, 



11. Ghymes . . . 1881, 16. Rozsnyo . . . 1870, 

 11. Fogaras . . . 1885, 17. Szepes-Bela . . 1888, 

 11. N.-Enyed . . 1884, 17. Medgyes . . . 1859, 



11. Ghymes . . . 1884, 18. 'Oravicza . . . 1882, 



12. Szep.-Bela . . 1885, 19. Ghymes . . . 1882, 

 12. Ghymes . . . 1874, 21. Szep.-Bela . . 1889, 



12. Ghymes .... 1889, 23. Szep.-Bela . . 1884, 



13. Medgyes ... . 1863, 24. Diod .... 1853. 



Of these points : 



Oravicza 49 18' 37 25' 793 in. is the northernmost 



Fogaras 45 51' 42 38' 430m. the southernmost 



Koszeg 47 23' 34 12' 274m. the westernmost 



Fogaras 45 51' 42 38' 430m. the easternmost 



The difference in time (time-difference) resulting from these 

 data led me to apply the following method, which produced a formula 

 and a mean figure. 



The compilation of the historical data extending over a period 

 of 88 years led to the establishment of the following country 

 formula (i. e. formula for the whole country generally) which relates 

 to the first appearance of the chimney-swallow (hirundo rustica), 

 in the places mentioned, during a period from 1848 1890. 



The chimney swallow appeared : 



earliest date : 20 th March, 1851 at Sopron ; 

 latest date: 24 th April, 1883 at Diod; 

 difference : 36 days ; 

 mean date : 7 th April ; 

 arrivals in March : 20 times ; 



April : 70 times ; 

 characteristic period : first half of April. 



One is struck by the day data, according to which the arrival 

 took place 4 times on March 30 th , 5 times on the 3 rd , 6 times on 

 the 4 th , 8 times on the 6 th of April etc., at different points, it is 

 true, and also in different years, facts which naturally excluded 

 any combinations being made therefrom. 



