BOWMAN LECTURE. 



XCI 



cataract may be transmitted through several generations, 

 that, as in the congenital forms, either sex may pass it on 

 to either sex or to both sexes, and that the descent is, 

 so far as we know, practically always continuous.* 

 Although either sex may transmit, the tendency is, how- 

 ever, in fact, passed on oftener by women than men, and 









2. i9 |+ if 14 17 18 iy it, LI 



not infrequently clings to the female sex through several 

 generations of a long pedigree. 



In one and the same family hereditary cataract often 

 begins at about the same age in all who have it. But 

 exceptions to this are very numerous, for, as we have just 



* Apparent discontinuity, however, is seen in one or two places in a 



few pedigrees, viz., in R.L.O.H., xvi, p. 390 (Fig. 46) ; ibid., p. 208, etc 



Cases 40, 80, 92, 100. The generation marked as normal in these, 



'pedigrees may, however, have contained some individuals with incipient 



cataract. 



