184 



MEMOIRS OF THE NATIONAL A(JADEMY OP SCIENCES. 



Names occurring 7 times: Davis, Jones. 



Names occurring 6 times: Kelly, Mitchell, Moore, Welch, White, Williams, Wright. 



Names occurriug 5 times : Adams, Allen, Clark, Hall, Lee, Long, Stejihens, Taylor, Thompson, Wolf. 



Names occurring 4 times : Bailey, Barnes, Berry, Cox, Gunn, Han'is, Hixon, Huffman, Jacoby, James 



MoCllelland, Murphy, Sturgeon, Sullivan, Townseud, Walker. 



Names occurring 3 times: Amnions, Baker, Ballard, Boyd, Brasher, Brooks, Buckley, Campbell, Carroll, 



Chamberlain, Conn, Gopher, Crawford, Darnell, Doyer, Ford, Fuller, Gibson, 

 Goodner, Goodwin, Gortschalg, Gray, Harper, Hill, Keil, Kennedy, Laughlin, 

 McFarland, McGary, McLean, McNeal, Merrill, Morgan, Neilson, Nichols, 

 Simmonds, Sterling, Stewarti, Stout. 



Names occurring 2 times: These are too numerous to be quoted here. There are 150 of them. 



Tlie following tables show that the pupils referred to above constitute more than 41 per cent, 

 of the whole number of pui)il8 admitted : 



Table VI. — Recurrence of surnames among the pupils of the Illinois Institution for the Deaj and 



Dumb, 



(1882 Report.) 



No. of pnpils 

 represented. 



953 names occur 1 time 953 



150 names occur 2 times 300 



39 names occur 3 times 117 



16 names occur 4 times 64 



10 names occur 5 times 50 



7 names occur 6 times 42 



2 n.ames occur 7 times 14 



1 name occurs 8 times 8 



2 names occur 9 times 18 



2 names occur 10 times 20 



1 name occurs 16 times 16 



1 name occurs 18 times 18 



1,184 1,620 



Table VII. — Recurrence of surnames and percentages of the whole. 

 (Illinois Institution, 1882 Rejiort.) 



The recurrence of numerous surnames among the pupils of very many of our institutions for 

 the deaf and dumb renders it highly probable that a considerable proportion of the deaf-mutes of the 

 country belong to families containing more than one deaf-mute, and hence possess hereditary tendencies 

 to deafness. 



The same conclusion is still more forcibly suggested to the mind by a perusal of the few insti- 

 tution reports that record the deaf-mute relatives of the pupils. The following tables (Tables 

 VIII, IX, X, XI, XII) bearing upon this subject have been compiled from the 1877 Report of the 



