22 THE BIOLOGY OF THE FROG chap. 



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

 phien. Vierteljahrsch. d. Naturf. Gesell. Zurich, LXII, 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 

 dee Thierreichs, Bd. VI, 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 l'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. Anatomie 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- 

 mie, 2 Bd. 



