466 Dr. A. L. Thomson : Results of a Studj/ of [Ibis. 



XXVI. — liesuUs of a Stiulj/ of liinl-Mirtration bij the 

 Mavkimj Method. By A. Landsborough Thomson, 

 O.B.E.,^M.A., D.Sc. 



CONTKNTS. 



1. lutroductioii : — I'age 



The Aberdteu University Eird-Jligratiou Inquiry . . 466 



Tlie Purposes of Bird-Marking- 468 



Historical Survey of Bird-Marking- 471 



Methods of the Aberdeen University Inquiry ...'... 475 



The Interpretation of Results 477 



The Numbers of Birds marked during the Aberdeen 



University Inquiry 481 



II. The Lapwing- : analysis of records 484 



III. The Woodcock : analysis of records 492 



LV. The Herring-Gull : analysis of records 495 



V. The Black-headed Gull : analysis of records 499 



VI. The Mallard : analysis of records '. 500 



^^11. The Starling : analysis of records 502 



VIII. The Song-Thrush : analysis of records 506 



IX. The Hedge-Sparrow : analysis of records 509 



X. Summaries of records regarding other species : — 



Swallow ; Greenfinch ; Goldfinch ; Chaffinch ; House- 

 Sparrow ; Great Titmouse; Blue Titmouse; Mistle- 

 Thrush; Blackbird; Redbreast; Spotted Flycatcher ; 

 Meadow-Pipit ; Swift ; Cuckoo; Barn-Owl ; Heron ; 

 Sheld-Duck ; Teal ; Wigeon ; Wood-Pigeon ; Golden 

 Plover; Ringed Plover ; Dunlin; Curlew; Oyster- 

 catcher ; Snipe ; Common Tern ; Little Tern ; 

 Common Gull ; Guillemot ; Corncrake ; Moorhen ; 



Red Grouse ; Partridge; etc 511 



XL Conclusions regarding Bird-Migration 521 



XII. Conclusions regarding the value of the method of Bird- 

 Marking 524 



XIII. References 526 



I.— INTRODUCTION. 



The Aberdeen University Bird-Migration 



Inquiry. 



This paper embodies the main results of the Aberdeen 



University Bird-Migration Inquiry, which was set on foot 



in 1909 for tho purpose of exploiting the method of study 



