No. 1.] ORIGIN OF HUMAN MONSTERS. 119 
TABLE XII. 
NorMAL EMBRYOS OF THE SIXTH WEEK. 
a 
Speci | Emb Chorion Es 
pecimen, | mbryo. orion. 2 
= 
| 
mm, mm. days 
lab Sail Giop le oeoaowe 12.8 40 X 32 
INO). Bice a oopeec 1a 37 
1: as ty ae ee a 13 30k 2hke a8 22 
lake (WE) \eSaloaeae 133 64 
Iba (839) ign Saomor | 13.6 35 x 28 63 
INQEPAAG ena evel sons’ I4 40 X 30 X 30 60 
INOS 20 Precis ee 38 14 Py ORONO 
AN Ore SOG Goss ave tc Yoke 14 55 
INO Rr OW rspeetans 14.5 30 X 30 X 30 65 
ING EOS tise o's «cts 15 94 
ise (Dt) ercettertere 15 45 X 40 
AISA ere eee se sts 15 25 x 28 
No. 256. Bgkie’s 16 60 
ING 2. G07 secu see > 16 AG 25 25 
Elise (iohis): *ssc 6s. ay} 51 
INO BOO octets sts ng) 54 
icli(o ige-o as Peete reer 17 Bema 26 
The first pathological specimen which I shall consider is 
No. 311, an unusually good one, for it is well preserved and 
there is every indication that the changes in it were produced 
gradually. Unfortunately, the menstrual age is not known, but 
I am of the opinion that it must be at least fifty days, that is, 
about two weeks more than normal embryos of the same 
size and degree of development. The chorion is covered with 
villi of unequal size, which show all degrees of activity, some 
being hypertrophic and others atrophic, fibrous and more or 
less invaded by leucocytes. The surrounding inflammatory 
process has gradually destroyed the villi. The condition of 
the vessels within the villi also indicates that the process of 
destruction has been gradual; the large villi contain fairly 
well developed capillaries, and the small ones are devoid of 
them altogether. The umbilical cord is enlarged in its center 
and very small at its attachment to the chorion. In general, 
it is fibrous and its blood-vessels are contracted and empty. 
The enlargement in the cord is due to the mucoid masses 
