19, 1889.] 



SCIENCE. 



45 



.all children of school age who are debarred by deafness from at- 

 tending ordinary schools for hearing persons. We wish the aid of 

 the census in obtaining the names and post-office addresses of such 

 children, in order to bring them into the special schools suited to 

 their-condition. 



" 2. The age or period of life at which deafness occurred is a 



which the deafness occurred. They should be instructed that this 

 point is of such vital importance to the correct classification of the 

 deaf that an answer must be obtained in every case, or a reason 

 assigned for non-reply. This reason may in some cases itself re- 

 veal the point desired. 



" 3. We recommend that in Schedule No. i the physical and 



<© 



<o 



rORM OF QUESTIONS ON DEFECTIVE CLASSES FOR TENTH CENSUS AND PROPOSED FORM FOR ELEVENTH CENSUS COMPARED. 



■more reUable element in determining the sub-class of the deaf to 

 which a person belongs than the presence or absence of the power 

 of speech, or the exact amount of muteness involved. We there- 

 fore recommend, that, in taking a census of the deaf, the enumer- 

 ators be specially required to ascertain the age or period of life at 



mental condition of each person be noted. The form of questions 

 as to physical and mental condition, as shown in Fig. 2, is sug- 

 gested for incorporation in that schedule. To ascertain the condi- 

 tion of the hearing, the enumerator should be instructed to ask first 

 whether the person can hear well. If the answer is ' Yes,' the 



