466 I)r. A. L. Thomson : Results of a Study of [Ibis, 
XXVI .—Results of a Study of Bird-Migration by the 
Marking Method. By A. Landsborough Thomson, 
O.B.E., M.A., D.Sc. 
Contents. 
I. Introduction :— Page 
Tlie Aberdeen University Bird-Migration Inquiry . . 466 
The 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 
IV. The Herring-Gull: analysis of records. 495 
V. The Black-headed Gull: analysis of records . 499 
VI. The Mallard : analysis of records . 500 
VII. 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 
XI. 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-Migratiou Inquiry, which was set on foot 
in 1909 for the purpose of exploiting the method of study 
