MICHIGAN ACADEMY OF SCIENCE. 105 



reiiuiiniiig in the body cavity forward. Thus there is an increas- 

 ing: tendency for them to get into the funnel. 



If this interpretation is correct, one would expect that occasion- 

 ally a few eggs would be left permanently in the body cavity; such 

 a mechanism could not be expected to work with absolute perfec- 

 tion. Observation shows that this is what actually occurs. In 

 many specimens of Cryptobranchus, after spawning, a few eggs are 

 still to be found in the body cavity; if the animals were allowed 

 to live these eggs would probably later be absorbed. On the other 

 hand, if eggs were carried into the oviducts by ciliaiy action, one 

 would expect that none would be left behind. 



In examining Newport's extensive contributions on the early 

 development of the amphibia, one cannot fail to be impressed by 

 his masterly analysis of the problems of embryology and by the 

 pioneer character of his work. With almost prophetic insight he 

 has laid the foundations of much of the ''experimental embryology" 

 of a later generation. 



Zoological Laboratory, State Normal College, Ypsilanti, Mich. 



Literature. 



Brandt, Alexander. 1876. Fragmentarische Bemerkungen uber 

 das Ovarium des Frosches. Zeitscher. f. wiss. Zoologie, Bd. 

 XXVIII. 



King, H. D. 1902, The follicle sacs of the amphibian ovary. Bio- 

 logical Bulletin, vol. III. 



Morgan, T. H. 1897. The development of the frog's egg (pp. 16 

 and 17). The Macmillan Co. 



Neivport, G. 1851. On the impregnation of the ovum in the am- 

 phibia. Philos. Trans. Roy. Soc, London. 



Nusslamn, M. 1895. Zur Mechanik der Eiablage bei Rana fusca. 

 Archiv f. mikr. Anat., Bd. 46. 



