AVES. 279 



eggs, then upon that of climate ; furthermore, on their colouring matter, 

 and the influence of incubation upon the development of this body on the 

 surface of the shell ; and, finally, the relation that may occur between the 

 form and general arrangement of the spots upon the shell-surface of the 

 coloured eggs, with their mode of exit from the cloaca. 



Meyer's coloured Illustrations of British Birds, with the 

 eggs of each species, London, 4to, are only known to me 

 by advertisement. 



Among the many ornithological articles in D'Orbigny's 

 Diet. Univ. de 1'Hist. Naturelle mention need only be made 

 here of torn. iv. 



Waterton's Essays on Natural History, chiefly Ornitho- 

 logy, Ed. 5th, London, 1844, is, from its radically fanatical 

 tendencies, as well as its ill-arranged information, un- 

 worthy to be handled as subject matter for scientific con- 

 sideration. A closer determination of some muscles on the 

 anterior members of Birds has been proposed by Retzius. 

 (Forhaudl. vid. de skand. Naturf. Stock, 1843, p. 659. 

 Isis, 1845, S. 440.) The same writer treats of the structure 

 of the stomach in Birds, Isis, 1845, S. 445. Remarks upon 

 the theory of the Bird's flight are to be found in Voy. 

 autour du Monde sur la Fregate la Venus, x,, Physique, 

 v, pp. 107, 268. 



We have not this time been so richly furnished with 

 special Faunas as heretofore. In the first place it is to be 

 mentioned that ' Naumann's distinguished Naturgeschichte 

 der Vogel Deutschlands' has now reached its termination. 

 Schlegel's and Susemihl's Bearbeitung der Vogel Europa's, 

 as well as Zander's Naturgeschichte der Vogel Mecklen- 

 burg's (5tes Heft,) are still in progress. 



In H. Schlegel's Kritische Uebersicht der europaischen 

 Vogel Leid. 1844, also entitled Revue Critique des Oiseaux 

 d'Europe ; the species have been first of all brought forward 

 with their synonyms and abodes ; then, in a special division of 

 the work, critical discussions are appended, touching feebly 

 determined or readily confusible species, a point by which 

 this work acquires great value, and is to be regarded as an 



