1 92 1.] Velocity of Mhjratory Flight among Birds. 



2S3 



Species. Place. 



Lammergeier Quetta. 



Lammorgeier Italy. 



White Stork Mesopotamia. 



Grey Heron France. 



Gannets Eastbourne. 



Pelican S. Palestine. 



Geese ? 



Ground 

 speed : 

 m.p.h. 



79| 



*110 



Remarks. 



*48 



under *45 



*48 



51 



44-3 



Houbara Bustard . Quetta. 



42i 



Gliding to food at angle of 

 12 degrees to horizontal. 

 Strong side wind. See note A. 



Bird nose-diving to escape from 

 a pursuing aei-oplano. Obser- 

 vation taken with air-speed 

 indicator. (E.A.F.) 



Birds on spring passage at 4200 

 feet over Baghdad. Birds drew 

 in their necks and legs when 

 machine was near. (E.A.F.) 



By air-speed indicator. (E.A.F.) 



By air-speed indicator. (E.A.F.) 



Altitude of flight 1240 feet. 

 A side wind of 15 m.p.h. See 

 note D. 



Altitude of flight 905 feet. 

 Measured by theodolite. (Clay- 

 ton, ' Science,' n. s., vol. v. 

 No. 105.) 



By air-speed indicator. (E.A.F.) 



Frequent observation by air- 

 speed indicator. Birds usually 

 on passage, biit all below 3000 

 feet. (E.A.F.) 



Altitude of flight 4210 

 Head wind of 9 m.p.h. 

 note F. 



Altitude of flight 958 

 Measured by a sj^ecial 

 dolite. (Clayton, ibid.) 



Eleven observations, 

 calm. See note A. 



By air-speed indicator. (Wynne.) 



By air-speed indicator. Birds 

 believed to be on passage. 

 ( Wynne.) 



By air-speed indicator. (E.A.F.) 



Single bird flying low and 

 leisurely. See note E. 



A single bird. Wind calm. 

 See note A. 



feet. 

 See 



feet, 

 theo- 



Wind 



* Air-speed. 



SER. XI. VOL. 111. 



