22 THE BIOLOGY OF THE FROG chap. 



Fischer-Sigwart, H. Biologische Beobachtungen an unseren Am- 

 phien. Vierteljahrsch. d. Naturf. Gesell. Zurich, LXH, Jahrg. 1897. 



Gadow, H. Amphibia and Reptiles. Vol. 8 of the Cambridge 

 Natural History. 



Hay, 0. P. The Batrachians and Reptiles of the State of Indiana, 

 1892, 17th Ann. Rep. Dept. Geol. and Natural Resources. 



Hoffmann, C. K. " Amphibien," in Bronn's Classen und Ordnungen 

 des Thierreichs, Bd. \T, 2. 



Holbrook, J. E. North American Herpetology. 



Jordan, D. S. A Manual of the Vertebrate Animals of the Northern 

 United States, 9th ed., 1904. 



Leydig, F. Die anuren Batrachier des deutschen Fauna, 1877. 



Rosel von Rosenhof. Historia naturalis ranarum nostratium, 1758^ 



Spallanzani, L. Experiences pour servir a I'Histoire de la genera- 

 tion, 1787. 



Accounts of the general anatomy of the frog are contained in the 

 following works : — 



Bourne, G. C. An Introduction to the Study of the Comparative 

 Anatomy of Animals, 2 vols., 1900. 



Ecker, A. Anatomy of the Frog, translated by George Haslam, 

 Oxford, 1889. 



Ecker und Wiederscheim. Anatomic des Frosches, auf Grund 

 eigener Untersuchungen durchaus neu bearbeitet von Dr. Ernst Gaupp, 

 1 896- 1 904. 



Howes, G. B. Atlas of Practical Elementary Zootomy, 1902. 



Huxley and Martin. General Biology, 1889. 



Marshall, A. M. The Frog : an Introduction to Anatomy, 6 ed., 1896. 



Mivart, St. George. The Common Frog, 1874. 



Parker and Parker. An Elementary Course in Practical Zoology, 

 1900. 



Vogt und Yung. Lehrbuch der praktischen vergleichenden Anato- 

 mic, 2 Bd. 



