ROUTES OF MIGRATION. 



4. *Gatke : „Die Vogelwarte Helgoland" 1 89 1 . (also with J . Cordeaux). 



5.*Hartmann : „Stroda Bidrag till Skandinavisk Fauna" 1858. 



6. *HiERONYMUS: „Ober das periodische Verschwinden vieler Vogel 



zur Herbstzeit" 1857. Journ. f. Ornith. 

 7.*Kessler: „Einige Beitrage zur Wanderungsgeschichte der Zug- 



vogel" Bull, de la Soc. des Nat. de Moscou, 1853. 



8. Menzbier: „Die Zugstrassen der Vogel im europaischen Russ- 

 land" Bull, de la Soc. des Nat. de Moscou, 1886. 



9. MiDDENDORFF A. : „Die Isepiptesen der Vogel im europaischen 

 Russland" 1855. 



10.*MiDDENDORFF A.: „Sibirische Reise" Tom. IV. 1873-1874. 

 11.*Naumann: „Naturgeschichte der Vogel Deutschlands" 1. 1880. 



12. Palmen: „Om foglarnes flyttingsvagar" 1874. 



13. QuiNET: „Consid. surles Oiseaux d'Egypte" Ornis Xll. 1902—3. 

 14.*SCHLEGEL: „De Dieren van Nederland" 1860. 



15. Severtzow: „Allgemeine Obersicht der aralo-tianschanischen 

 Ornis." Journ. f. Ornith. 1873—76. 



16. Severtzow : „Etudes sur le passage des Oiseaux dans I'Asie Cen- 

 trale part, par le Ferghanah et le Pamyr." 1875. 



17. *Wallenoreen : „Die Briitezonen der Vogel innerhalb Skandina- 

 viens" Naumannia 1854 56. 



18.*Cordeaux: „On the Migration of Birds etc." Compte rendu II. Int. 



Orn. Congress at Budapest. 1892 p. 165. 



A glance at the annexed map should explain the statement that 

 Birds in their Migration from one zone to another, even if they had 

 the will, could not possibly follow all directions which authors invented 

 for them, and herein lies the weakness of the method which is founded 

 almost on mere supposition. 



I have allowed myself only to draw a single line and that on posi- 

 tive grounds. From Palmen's Migration-routes, I take the line „Nile" 

 — which there, begins at about the latitude of Cairo — with Lado 

 (lat. 5" 2' 0" N., long. 50" E., 465 Metres above sea-level) as the starting 



[Zi 14 <0 



