F. A. E. Crew 165 



growing spermatic tissues envelop ova and pigment along the line of 

 junction of ovary — and testis-portions), where they remain more or less 

 healthy for a considerable time, resisting destruction by virtue of their 

 maturity and being nourished and protected by the surrounding tissues, 

 while the other ovarian structures are destroyed and removed. The 

 presence of such ova is sufficient indication that the testis which 

 includes them has been an ovo-testis. These ova are doomed and 

 ultimately become resorbed, leaving the testis perfectly normal. 



The question as to whether these ova are to be found actually 

 within the seminal tubules is of some importance, since if they are 

 found in this situation, it is not unreasonable to suggest that such cells 

 may be the results of the division of spermatogonia. There is, however, 

 no reason why ova produced by the ovary-portion of an ovo-testis 

 should not be found within a seminal tubule of the testis-portion of the 

 gonad, and if these cells are also found between the tubules, then force 

 is given to the contention that they are ova, and that they are the pro- 

 ducts of ovarian and not of spermatic tissue. 



When such an ovum is found within a seminal tubule, the sperma- 

 tozoa also present therein are greatly compressed. The ovum thus may 

 have the normal structure, while the spermatozoa may be deformed and 

 degenerate. But this djegeneration is the result of local pressure, and is 

 not an indication that the ovarian tissue generally is healthy and 

 spermatic degenerate. When the ovum is situated between the seminal 

 tubules, those in the neighbourhood are contorted and misshapen. 

 This is the result of local hyperplasia of the intertubular connective 

 tissue, which follows the irritation set up by the presence of the foreign 

 body — the ovum and its pigment. 



It is seen that Ov. 4 type ovarian tissue does not occur alone, but 

 only in association with spermatic tissue. Sp. 1 tissue is such as is 

 found in the very earliest stages, and in the closing stages of this pro- 

 cess : in the first it is associated with type Ov. I ovarian tissue. But 

 in the closing stages, ova which have been extruded from the ovarian 

 tissues, so that these are such as have been designated by the formula 

 Sp. 2, and all that remains of the other ovarian tissues, is the pigment 

 which is massed along the outer border of the gonad. 



There is no gonad with the constitution Sp. 2, Ov. 1. This is because 

 in the case of type Ov. 1 ovarian tissue, there is, as yet, no appreciable 

 degeneration and no considerable degree of growth on the part of the 

 spermatic tissue. It is by the active enveloping growth of the spermatic 

 tissue that ovarian ova and pigment become included within them. 



11—2 



