527 
1921 .] Bird-Migration by the Marking Method. 
(9) Mortensen, H. Chr. C. (1907).—“ Ringfugle.” (Dansk Ornith. 
Forenings Tidsskrift, i., 144.) 
(10) - (1909).— u Teal in Winter.” ( Vidensk . Mecld. fra den 
Naturhist. Forening i Kobenhavn, 1908, 127.) 
(11) - (1911). — “ Meddelelse 0111 Nogle Ringfugle.” ( Dansk 
Ornith. Forenings Tidsskrift, v., 115.) 
(12) - (1912).—“ Fra Fuglemaerkestationen i Viborg.” (Dansk 
Ornith. Forenings Tidsskrift, vi., 98.) 
(13) - (1920).—“ Maerkede Storke.” ( Dansk Ornith. Forenings 
Tidsskrift , xiv., 91.) 
(14) Percy, Lord William (1909).— (Country Life , 1909, 323.) 
(15) Schenk, Jakob (1910). — “Das Experiment in der Vogelzugs- 
forscliung.” (Bericht iiber den V. Internationalen Orni- 
thologen-Kongress, 175) : and see Herman. 
(16) Thienemann, J. (1904 et seq.). —“ Jabresberichte der Vogelwarte 
Rossitten.” (Published annually in Journal fur Orni- 
thologie.) 
(17) - (1910).—“ Der Zug des Weissen Storches.” (Zool. Jahrb., 
Suppl. xii., 665.) 
(18) Thomson, A. Landsborough (1909). —“ The Possibilities ot Bird- 
Marking.” (Proc. Boy. Phys. Soc. Fdin., xviii., 204.) 
(19) - (1912).—“ Aberdeen University Bird-Migration Inquiry : 
First Interim Report (1909-12).” (Scot. Nat., 1912, 144, 
and 1913, 29.) 
(20) - (1915).—“ Aberdeen University Bird-Migration Inquiry : 
Second Interim Report (1912-14).” (Scot. Nat., 1915,313.) 
(21) Ticehurst, Claud B. (1908).— (British Birds Mag., ii., 35.) 
(22) Tomlinson, Richard ( per J. A. Harvie-Brown) (1907).— 
(Annals Scot. Nat. Hist., 1907, 114.) 
(23) Van Oort, E. 1). (1911 et seq.). —“ Bird Marking in the Nether¬ 
lands.” (Notes from the Leyden Museum, xxxiv., 55): 
and subsequent periodical reports. 
(24) Weigold, Hugo (1910).—“Die Vogelwarte Helgoland einst und 
jetzt und die Methoden der Vogelzugsforsclmng.” 
(Bericht iiber den V. Internationalen Ornithologen-Kon- 
gress, 563.) 
(25) - (1910 et seq.). —“ Jabresberichte iiber den Vogelzug auf 
Helgoland.” (Published annually in Journal fur Orni- 
thologie.) 
(26) Witherby, H. F. (1909 et seq.). — (British Birds Mag., iii. et seq., 
passim.) 
