110 



Prof. Moore, Dr. Koaf, and Mr. Whitley. 



[Oct. 9, 



Experiments with 

 Table I.— 

 Experiment No. 1, 





Amount of sodium 



Amount of added alkali 



Observations of condition 





hydrate in decmormal 



in the solution, ex- 







No. 



solution, added to 



pressed as a fraction of 











200 c.c. of sea-water. 



normal strength. 



4 hrs. 



17 h. 50 m. 





1 



Control 



— 



Four-celled stage 



Blastula? 





2 



-2 c.c. 



o-oooi 



Four-celled stage 



Blastuloe 





3 



0-4 „ 



0-0002 



Four-celled stage 







4 



0-8 „ 



0-0004 



Four-, six-, and 



Blastula?. Further 











eight - celled 



advanced in cell- 











stages. Irregu- 



division than con- 











lar divisions 



trol 





5 



1-4 „ 



0-0007 



Four-celled stage. 



Blastulae. Further 











Irregular divi- 



developed than 











sion of cells 



control 





6 



2-0 „ 



- 0010 



Majority two- 



Blastulse. Further 











celled. A few 



developed than 











four-celled. 



control 





* In order to distinguish throughout between different sets of eggs, each lot of fertilized 

 It is to be noted in this experiment that there is a distinct favouring action of the added 

 stages of No. 6, but not in sufficient amount to stop growth (see Experiment 2), and as the alkali 

 Also Nos. 4, 5 and 6 remain alive and develop further than Nos. 1, 2 and 3. 



No. 5 was, at the end of the period 91 h. 50 m., divided into two portions of 100 c.c. each, 

 it. The subsequent development of 5b, which had the alkali added, was much more rapid than 



