292 ANIMAL INTELLIGENCE 
If I have failed to understand Prof. Baldwin fully, 
and so to appreciate his views at their full value on 
the score of originality, I regret it. However, it is 
likely that others are in the same case, and I venture 
to suggest that the remedy for our denseness, if such 
it be, is to be found in a specific and concrete treat- 
ment of the subject. WESLEY MILLS. 
M‘Gitt University, MontrEAt. 
Tuk HABIT OF DRINKING IN YOUNG Birps.* 
To THE EpiIToR oF Science.—In response to a request 
that has just reached me, may I ask for space in your 
columns to say that the statement I made with regard 
to the habit of drinking in young birds was to the 
following effect? The chicks that I have observed 
pick instinctively at any small objects at suitable 
distance. If a small drop of water be such an object, 
they will peck at that. But if a shallow tin of water 
be placed in their run the stimulus of the sight of 
still water does not evoke any instinctive drinking 
response. If there be grains of sands or food or 
other objects at the bottom of the tin, they will peck 
at these, and incidentally find the water. Sometimes 
they will peck at a bubble on the brim. Sometimes, 
* As Prof. Morgan explained, in a communication to Science, he 
refrained from taking an active part in this discussion because he was 
engaged at the time on his ‘‘ Habit and Instinct,” in which the subject 
was to be fully considered. Since then that work has appeared, and 
in acute, philosophical insight, clearness, and general charm of treat- 
ment, is equal to anything that has yet come from this able writer’s 
pen. In this work he has also, in the most generous way, acknow- 
ledged the contributions of myself and others to the subject under 
consideration. —W. M. 
