283 



VIII from cartilage, and IX is from the wall of a blood vessel. Similar 

 cases were also found in the entodermal structures. These nuclear 

 forms are not as frequent as in species where mitosis is less common 

 or absent but they are too common to be accounted for on the basis 

 of degeneration. 







II 







Amblystoma punctatum. Amitosis has been observed by 

 various authors in amphibian tissues. In embryos and young larvae 

 of Amblystoma the large size of the nuclei renders observation easy. 

 Mitoses are present but in addition to them nuclei like those shown 

 in Figures 10 and 11 are often found. Nos. I — IV are from the ecto- 

 derm, No. V is from the neural tube, and Nos. VI— VIII are from various 



