442 
RAYMOND 
M. SELLE 
5. Stage 2. This is the stage of desquamation of the flattened, 
scale-like, non-nucleated cells—cornified cells. The inner corni- 
fied portion of the vaginal mucosa loosens and may be shed as a 
cast. 
TABLE 2 
Showing the length of consecutive cycles in twenty guinea-pigs from August, 1920, to 
January, 1921 
AVERAGE 
ANIMAL LENGTH OF CONSECUTIVE CYCLES IN DAYS LENGTH OF 
CYCLE 
199 16; TGS Wig LG May 16.50 
200! 15, 14, 15 14.66 
2061 1516; 16216; 1G 7s lop6 15.75 
208 (LO 1 5seks, LO okie veal Ornlo 16.22 
211 162.16" 16; 16) 17, S16 16.00 
213! V7ianG 16.50 
220 15, 16, 16 15.66 
232 15, 15 155; lo; Lo, ald 15.42 
233 16; 17; 16 16.33 
246 14, 14, 16, 16, 16, 16, 16, 15 15.37 
262! 15,16, 15,16, 16; 15; lo Ose (ers 15.66 
Tipe 17, 16 16.50 
277 ANG leg 16.50 
279 16, 16 16.00 
280 15, 16; 15, 16; 167 16, 15, 15, 15; 15 15.40 
281! 16 16.00 
282 17,06, 11% 16.66 
285 1G GS he TO Vie eie aon 16.44 
2961 17. Toy 1G. AG. 6. 6) 16 alos to, 16 16.00 
298 16) 15; 15,9 145515; ib; 6 15.28 
INfumbenxotal4-cayvaevcles san rie aliens 1: venkaeeRae etchant rar 4 
Number orn 5-dayeGycless 5 . kat yaad itis tect. 9c chee ste tae oy -Peraetan ota toha tet 28 
Nim bex tate 1 Gay" Cy Chess. ers cto tact et aetotan ns © hs evsuel ithe hers nets mers ae 57 
Numibertor- 17-day cy clesel hain: tet er teste <tocieters ss ude ia e hres taanlnneat 22 
Totalkmumber Ol Cy Clestit antes nck ea at oe trap ate eials whee. whi mtayorelp late eae 111 
Wiodetss tae: Ot wile Sa ee ge etn: Meee Wh Lace amend Ry iter 16.0 days 
Goeneraliawerager.(. Aare eee ccs mane. gaat ian ae oie as 15.87 days 
1 Animals having both horns of the uterus excised. 
6. Stage 3. 
Vaginal smears made during this stage contain 
round, nucleated, epithelial cells and some cornified cells which 
have remained from the preceding stage. Leucocytosis begins 
during this stage but leucocytes do not enter the lumen. 
