FLIGHT OF BIRDS MEINERTZHAGEX. 



367 



As regards more accurate data, it was my fortune during the recent 

 war to have the opportunity of using antiaircraft arrangements for 

 my purpose. It was excellent practice for the men, and the results 

 can be taken as accurate for all practical purposes. In conjunction 

 with observations of an accurate nature from other sources, I have 

 compiled the following table. 



Unless the authority is stated in parentheses, the observations are 

 my own. 



The following notes refer to the table : 



Note A. — Observations taken at Quetta by two persons with stop watches over a 

 measured distance varying from 400 to 060 yards. All birds were below 1,000 feet, and 

 in no case were they migrating. 



Note B. — Observations taken in East Africa in the autumn of 1915 on migrants by 

 using theodolites on a base of 1,200 feet. 



Note C. — Observations made at Dar-es-Salaam by a system of two persons with stop 

 watches stationed 440 yards apart and timing birds flying between points aligned by two 

 stakes. All observations taken on still evenings when birds were flying to and from 

 their breeding grounds. 



Note D.— Observations made near Rafa, in southern Palestine, during the autumn of 

 1917 by means of theodolites at two antiaircraft gun stations on a base of 3,926 feet, 

 the stations being connected by telephone. 



Note E. — Observations taken in southern Palestine by stop watches at 440 yards dis- 

 tance and timing birds flying between two points aligned by posts. 



Note F. — Observations made near Montreuil, in northeast France, by means of theod- 

 olites on a 1,420-foot base and small balloons to ascertain the velocity of the wind 

 at the altitude of flight. All birds believed to be on migration. 



i Air speed 



