REPORT ABOUT THE HUNGARIAN BIRD BANDING WORK. 79 



done on this field of scientific researches and final dates can be obtained 

 only through the capturing of breeding birds. 



Concerning this, I should like to call the attention to the exemplary 

 organisation of the renowned „Biological Survey" in North- America, which 

 was created by the initiatiwe of Prentiss Baldwin, who is well known 

 through his succesful works relating to the matter in question. 



Finally I should like to call your attention on the statistics of 

 propagation, When the young birds are banded their number is noted 

 with the statement wether of the first or second breeding and then 

 on the score of these dates the propagation coeficient is ascertained. 

 Concerning the storks I have obtained since a range of years the 

 following dates. 



In the year 1909, 397 breeding pairs had 1094 young ones ; prop. coef. 2*76 



., . „ 1910, 393 , „ „ 1120 . „ „ „ 2-83 



„ „ „ 1911, 264 „ „ „ 757 „ , . , 2-87 



„ „ , 1912, 319 „ „ , 210 , , , , 3-28 



„ , „ 1913, 210 „ , „ 569 „ „ . , 2-71 



, „ „ 1914, 254 ., ,. „ 892 „ ^ „ , 3-51 



„ „ „ 1915, 136 „ „ , 509 - „ „ ., 3-74 



„ , „ 1916, 115 „ , „ 293 „ „ „ , 3-42 



„ , „ 1917, 67 „ „ „ 196 , , . „ 2-93 



„ „ „ 1918, 21 , , ,. 72 „ „ „ „ 2-32 



, , „ 1922, 23 - „ . 78 ^ , , . 3-39 



The propagation coeficient is as one can see according to the years 

 very different and even in the world of the birds are fat and meagre 

 years exactly like in the agricultury. The dates relating to this question, 

 ■eventually together with the statistic of the propagation of mankind could 

 he of great interest, though just at present we can give no hints to their 

 further employment. All these statements illustrate that the banding 

 experiment promises still a large field of work and the Roy. Hung. 

 Institute for Ornithology will do its utmost to further it in this direction. 



As a supplement to this report I refer to the statistics contained 

 •in the Hungarian text p. 59 — 65 and the headnumbers in the last of this 

 have the following meaning: 1. Designation wether nestling or adult bird 

 had been banded. 2. Date of the banding. 3. Place of banding. 4. Date 

 and 5., place of recapturing. 6. Age. 7. Direction and 8., distance from 

 the finding-place of banding. 



