TABLE 2 
Showing condition of ducts, nephrostomes, and glomeruli in embryos from vhich 
one pronephros has been removed 
SERIES 
NUMBER 
AGE 
DUCT ON 
OPERATED SIDE 
DUCT ON 
UNOPERATED 
SIDE 
NEPHROSTOMES 
GLOMERULI 
days 
A 54 
4 
Canalized at in- 
Round, 
Anterior present, 
Both present 
tervals, flat- 
canal- 
posterior ab- 
tened 
ized, 
definite 
sent 
A 51 
5 
Small, canalized. 
Large, 
Anterior present. 
Both present 
flattened 
round, 
canalized 
posterior pres- 
ent 
A 51 
6 
Small, flattened, 
Large, 
No anterior, pos- 
Both present 
atrophied pos- 
round 
terior present 
teriorly 
A 54 
7 
Small, canalized 
Large, 
Anterior present. 
Both present 
no. 1 
round 
posterior ab- 
sent 
A 54 
7 
Present anteri- 
Large, 
Anterior present. 
Both present 
no. 2 
orlj" atrophied 
posteriorly 
round 
posterior pres- 
ent 
A 54 
7 
Present anteri- 
Large, 
Anterior absent, 
Both present 
no. 3 
orly, atrophied 
posteriorly 
round 
posterior pres- 
ent 
A 8 
9 
Small, slightly 
Large, 
Small anterior. 
Both present 
canalized 
round 
no posterior 
A 1 
10 
A few degenerat- 
Large, 
Anterior present. 
Both present 
ing cells 
round 
posterior ab- 
sent 
A 1 
11 
Small, irregu- 
larly canalized 
Very large 
Anterior present, 
posterior pres- 
ent 
Both present 
PN2 
17 
Very small but 
Large, 
2 anterior, 1 pos- 
Both present 
canalized pos- 
round 
terior 
teriorly 
PN3 
29 
Small, discontin- 
Large, but 
Anterior present, 
Both present 
uous anteriorly 
flattened 
anteri- 
orly 
posterior pres- 
ent 
PN4 
15 
Very small, 
Large, 
No anterior, pos- 
Both present 
(whole mount) 
(whole 
mount) 
terior present 
FN 5 
21 
Small (whole 
Large, 
No anterior, pos- 
Both present 
mount) 
(whole 
mount) 
terior present 
FN 6 
21 
Small anteriorly. 
Flattened 
Anterior present. 
Both present 
central portion 
anteri- 
posterior pres- 
discontinuous 
orly 
ent 
FN 71 
9 
Small anteriorly, 
Large, 
Anterior present, 
Both present 
none posteri- 
round 
posterior pres- 
orly 
ent 
1 For FN 7. 9 days, see figs. 18 and 20. 
380 
