422 JOURNAL OF SCIENCE, 
or one in fifteen hundred of the blind population deaf and dumb: in 
other words, we should expect to find no more than thirty-four blind 
deaf-mutes in the country; whereas, as a matter of fact, no less than 
four hundred and ninety-three blind-deaf mutes are returned in the 
census. 
In the following table, I., I present an analysis of the doubly and 
trebly defective classes. The information has been compiled from 
the published statements of Rev. Fred. H. Wines (who had charge of 
the department of the census relating to the defective classes), 
supplemented by unpublished information kindly furnished by the 
census office. 
TABLE I. 
Analysis of the defective classes as returned in the tenth census of the 
United States (1880). 
Singly defective. 
Deaf anddumb* ... “Ge uf ae — 30,995 
Blind hw ete <= 4. 1 Re 46,721 
Idiotic ae Bh, Pe Ms ~ ae 73,370 
Insane aA id a be 52 3 91,133 
Total singly defective ee a cele Tete Mirae eee 242,219 
Doubly defective. 
Blind deaf mutes... a ae a a 246 
Idiotic deaf mutes ... es chy ee oat 2,122 
Insane deaf-mutes ... a +: 5 ee 268 
Blind idiots ns ey ie "a if 1,186 
Insane blind 5s Bs a os Re 528 
Total doubly defective a abe Spine Rha oetoe eee 4,350 
Trebly defective. 
Blind idiotic deaf-mutes fs a. a = 217 
Blind insane deaf-mutes oa « she a 30 
Total trebly defective Re ro ee Cena DEEN 5 247 
Total defective population ... +f eh eC rettlel Ss 246,816 
* The ‘deaf and dumb’ have no other natural defect save that of deafness. They are simply 
persons who are deaf from childhood, and many of them are only ‘hard of hearing.’ They 
have no defect of the voeal organs to prevent them from speaking. A child who cannot hear our 
language with sufficient distinctness to imitate it remains dumb until specially instructed in the use 
of his vocal organs. In the above table, the ‘deaf and dumb’ are therefore classified with those 
having a single defect. 
In the following tables, II.,-VII., I have reduced these figures to 
percentages. 
TABLE II. 
Percentage of the population of the United States who are defective. 
Totals. | Percentage. 
Deaf and Dumb _... WA WHER «erst Harel 33,878 0.0675 
Blind rf ea ie + Se 48,928 00.975 
Idiotic 76,895 0.1533 
Insane 91,959 0.1833 
Defective population yer ae ae sh 246,816 0.4921 
Population not defective _... he 42 ...| 49,908, 967 99.5079 
Total population .., sii its «| 60,155,783 100.0000 
a rn p 
