ARTIFICIAL PARTHENOGENESIS IN ECHINUS ESCULENTUS. 537 
(3) 6 c.c. ditto . 
(4) 7 c.c. ditto . 
(5) 8 c.c. ditto . 
(d) R c.c. ditto . 
Table V {continiied). 
Lot I. Lot II. 
. Yeiy irregular divi- . A few irregular 64- 
sioii, considerable cell stages, 
cytoljsis 
— . Large number of 64- 
cell stages, but 
irregular and flat- 
tened. 
. K uuierous swimming . Large number of 
lilastula?. 40'/p iierfectly regular 
64-cell stages, no 
cytolysis. 80% 
eggs attempted di- 
vision and 50“/^ 
formed blastula;. 
. Considerable cytoly- . Good number of 64- 
sis. many egg-frag- cell stages. all 
ments. No bias- rather irregular 
tube and tending to 
separate in groups. 
Table VI. 
Lot I. Lot II. 
(1) 8 C.C. :l o M NaCl -f 50 C.C. . Cleavage irregu- . l0°/g normal blas- 
sea-water for 30 min. hir. Afewbhis- tuUc. 
tukc 
(2) Ditto, 45 min. . 50° /g blastuhc . 50° blastula*. 
Some lialf-bl :is- 
tula*. 
(3) Ditto, 6o min. A few blastuhc . A few half-bhis- 
tuhe only. 
Table A'II. 
(1) 7 c.c. '2 5 M NiiCl + 50 c.c. sea-water 
30 min. ...... 
(2) Ditto, 60 mill 
(3) 8 c.c. ditto, 30 min. .... 
(4) Ditto. 6(1 min. ..... 
(5) 0 c.c. ditto, 30 min. ... 
(6) Ditto, (>o min. ..... 
( \ eiy few iittempts at 
j division. 
. Few attempts iit division. 
. 80°/o swimming blastuhc, 
60°/o normal. 
. Few attempts at division. 
. 80°/o swimming blastuhc, 
60°/ o normal. 
