BOWMAN LECTUEE. 



LXXIII 



extensive pedigree of hereditary ataxy* (Fig. 10), and 

 possibly in some of the other chronic diseases of cord 

 and brain. When a disease tends always to occur at a 

 later age in one sex than the other, the comparison as to 

 anticipation in hereditary examples must of course be 

 made between members of the same sex. 



It appears to me that the subject of anticipation 

 deserves much more attention than it has received in 

 relation to theories of heredity and to the origin and 

 extinction of heritable conditions. 



We may note that the reverse process, appearance of 

 the disease at a later age in the later born, though 

 * Sanger Brown, Brain, xv, 1892, p. 250, and xx, 1897, p. 276. 



2 



