PLATE 14 
EXPLANATION OF FIGURES 
Maturation and fertilization. 
1 Large ovarian egg with discus proligerus, from No. 21;5 4. X 200. 
2 Ninth of 23 sections through tubal ovum No. 307 (1); polar body is in 
nineteenth section; egg is surrounded with thin albumen layer; Bouin; 5 pu. — 
x 200. 
3 Portion of fig. 2; 7 chromosomes are seen; 5 yu. X 500. 
4 Tenth section of same egg; 5 chromosomes; zona pellucida is a beaded 
line with darkly staining granules; 5 y. 
5 and 6 Eleventh section (total 20 sections) through ovum No. 307 (3); the 
second maturation spindle has 12 chromosomes; Bouin; 5 u. X 200 and X 500, 
respectively. 
7 Sketch of ovum No. 56 (11), from total preparation drawn with focus on 
middle of egg; chromosomes and polar body; Bouin. X 200. 
8 Sixth section through ovum No. 76 (1); total 23 sections; 6 chromosomes of 
this section are in ovum and one in polar body; Bouin; 5 yu. X 200. 
9and10 Second maturation spindle of egg No. 307 (2); tenth and eleventh 
sections (total 23 sections); 12 chromosomes; Bouin; 5 4. X 500. 
11 Portion of ninth section of ovum No. 76 (8); total 15 sections; 12 chromo- 
somes in homogeneous granular area; little albumen at left; Hill’s fluid. X 500. 
12 Ovum No. 313 (2); eleventh section (total 20); marginal granular zone 
limited within by reticulated region; oil globules of medium size; a little albumen 
at left; Hill’s fluid; 5 yu. X 200. 
13 Ovum 76 (6); composite of fifth and sixth sections (total 21); polar body 
and short spindle with 7 chromosomes 5 »; Bouin. X 2500. 
14 Ovum No. 56 (6); portion of fourth section (total 17); there are 12 chro- 
mosomes; Bouin. XX 500. 
15, 16, and 17 Ovum No. 76 (4); 2nd, 3rd and 4th sections tangentially (total 
25 sections); polar body and equatorial plate of maturation spindle; marginal 
granular zone, vacuoles and oil globules; Hill’s fluid; 54. X 500. 
18 Ovum No. 313 (5) from same litter as fig. 12; 5th section (total 20); large 
fat globules; albumen layer thick (compare fig. 1, pl. 3). 
19 Young unfertilized uterine ovum, No. 287 (5); 9th section (total 16); 
concentric lamellae of albumen; compare fig. 12; Hill’s fluid; 54. X 200. 
20 Ovum No. 203 (1) with pronuclei; 10th section (total 20); 54. X 200. 
21 Ovum No. 52 (3); composite of sections 12 to 15 (total 20) taken obliquely 
through first cleavage spindle; a little yolk has been extruded (Y); Bouin; 5 pz. 
x 200. 
