this was communicated by Darwin to Romanes. One of his
children who was just beginning to speak, called a duck a "quack." By an
appreciation of the resemblance of qualities it next extended the term
"quack" to denote all birds and insects on the one hand, and all fluid
objects on the other. Lastly, by a still more delicate appreciation of
resemblance the child called all coins "quack" because on the back of a
French sou it had seen the representation of an eagle (Romanes' "Mental
Evolution in Man," p. 183). Later on, children who have been educated
acquire a knowledge of the application of visual symbols, and how to
represent them by drawing and writing, and associate them with persons and
objects.

3. There is more definiteness of impression and readiness of recall for
auditory than for articulatory motor sense feelings.

4. After the acquirement of speech by the child, auditory feelings are
still necessary for articulate speech processes; for if it were not so, how
could we explain the fact that a child up to the fifth or sixth year in
full possession of speech will become dumb if it loses the sense of hearing
from middle-ear disease, unless it be educated later by lip language.

5. Cases have been recorded of bilateral lesion of the auditory centre of
the brain producing loss of hearing and loss of speech, the motor centres
being unaffected. This is called Wernicke's sensory aphasia. The following
case occurring in my own practice is probably the most complete instance
recorded.

CASE OF DEAFNESS ARISING FROM DESTRUCTION OF THE AUDITORY CENTRES IN THE
BRAIN CAUSING LOSS OF SPEECH

A woman at the age of twenty suddenly became unconscious and remained so
for three hours; on recovery of consciousness it was found she could not
speak; this condition remained for a fortnight; speech gradually returned,
although it was impaired for a month or more. She married, but soon after
marriage she suddenly lost her hearing completely, remaining permanently
stone deaf; and although she could understand anything of a simple
character when written, and was able imperfectly to copy sentences, she was
unable to speak. Once, however, under great emotional excitement, while I
was examining her by written questions, she uttered, "Is that." But she was
never heard to speak again during the subsequent five years that she lived.
The utterance of those two words, however, showed that the loss of speech
was not due to a defect of t