62 MALL. [Vor. XIX. 
would not expect a higher per cent in ova from tubal preg- 
nancies. Instead, we find that 96 per cent are pathological 
and but 4 per cent normal (two in 46 specimens). Since this 
point is of prime importance in the causal study of terata, I 
have brought together all of the pathological ova I have 
obtained from tubal pregnancies. These have been studied 
with greater care, as a number of them have been cut into 
serial sections. Most of them will be found figured among 
the illustrations of this article. The following table shows 
that there are 14 specimens, of which seven contain patholog- 
ical embryos and six are entirely free of them. Nearly all 
of the ova are very small, and in practically all of them the 
chorion is markedly affected. Generally the mesoderm of the 
chorion is fibrous and atrophic, the villi also showing all kinds 
and degrees of degeneration. Occasionally some of the villi 
are hypertrophic: 
Dimen- Condition of 
Number. plone or Embryo. Chorion and Remarks. 
mm. mm. 
5S ja12'x 6 2, Vesicular | Atrophic. 
196 | 12x12 | 3, Homoge- | Atrophic—Some villi are en- 
neous larged and invaded by syn- 
cytium. 
2098 4 None Fibrous villi partly infiltrated 
with leucocytes. 
324 | 45X45 aot Atrophic and fibrous. No 
syncytium. 
342 | 30 X 20 5 Atrophic and fibrous. 
348 6, Atrophic 
361 10 None Coelom filled with a dense 
magma. 
367 |. Tox ¥ None Villi degenerated in part. 
369 7 x8 None Villi fibrous and degenerated. 
378 12 None Villi cedematous. 
396 7 2, Vesicular | Mesoderm and villi fibrous, 
some invasion by syncytium 
Plate II, Fig. 6 8 x 6 None 
Plate II, Fig. 5 6 Vesicular (?) 
Plate II, Fig. 7 | 60x20 II Chorion hypertrophic and em-. 
bryo disintegrating. 
In most instances the ccelom is filled with a dense magma 
and in six the embryo is entirely wanting. The embryos in 
the remaining seven are of the vesicular form in three, of 
