118 



Prof. Moore, Dr. Roaf, and Mr. Whitley. [Oct. 9, 



Table VIII.— Acetic Acid. 

 Experiment 1, Brood No. 6. 



No. 



Amount of 

 acetic acid 

 in N/10 

 solution, 

 added to 

 200 c.c. of 

 sea-water. 



Amount of 

 added acid 

 in the 

 solution, 

 expressed as 

 a fraction 

 of normal 

 strength. 



Observations of embryos at stated times after commencement 

 of experiment. 



18 h. 30 m. 



42 hrs. 



Control 

 -5 c.c. 



10 „ 



2- „ 



3- „ 



4- „ 



5- „ 



-00025 

 -0005 



o-ooio 



-0015 



0-002 

 -0025 



Many morulas and early 

 blastulse. Some four-celled 

 groups 



Morulas, occasional early 

 blastula. Not so far ad- 

 vanced as control 



Morulas only, 

 division 



Irregular 



Early stages and irregular 

 morulas. Many cells not 

 divided 



None beyond six- and eight- 

 celled stages 



All single-celled 

 All single-celled 



All stages to well-formed 

 blastulse 



All stages to late morulas. 

 Division irregular 



Same as No. 2 



Early morula?, and some late 

 morulas. Cells breaking up 



Chiefly early morulas, and 

 earlier stages. Irregular 

 division in earlier stages 



No stages beyond eight-celled. 

 Irregular division 



All single-celled 



