Chapter V. 



UPON THE GROWTH OF THE DEAF-MUTE POl'ULATION. 



The full letunis of the 1880 census, so far as regards the deaf and dnnih, have not yet been 

 publislied ; but, as stated before, liev. Frederick H. Wines, who had charge of this department of 

 the census, presented to the tenth convention of American instructors of the deaf and dumb the 

 results of an ^analysis of L':i,47li cases of deaf-mutes reported in the census returns. The tables 

 I)resented by Mr. Wines have been reproduced in the Appendix. (See Tables N, (), I', Q.) 



It will be observed that the cases are classified according to the period when deafness occurred 

 and according to the cause of deafness (whether congenital or not). I have rearranged these cases 

 into decades, so as to corresjiond with the classiiication of the pupils of the American Asylum 

 and Illinois Institution, and have represented the results graphically in the following diagram: 



Fio. 8. — Itelation between tin congeLit.al and nonconjji-uital deafmutes of tlie country, aicoiilmg to the liev. Fred. H. Wines. 

 The coneenital deaf-mutes are indicated by tlie dark line; the uon.con;xenita!, liy tlie li;;lit line. 



