THE PSYCHIC DEVELOPMENT OF YOUNG ANIMALS 261 
A pigeon (the same one used before) is thrown into 
the run where the hen and chicks are. It flies about a 
little, and then alights. The chicks did not show the 
least fear, etc., though the hen attacks the pigeon, 
uttering a faint sound (danger signal) peculiar to fowls 
when a bird, as a hawk, flies over them. 
9th day.—Feathers shooting out well. Differences in 
colour very marked. 
14th day.—Tried the Black Owl pigeon, as _ before. 
No special manifestations on the part of the chicks, nor 
were there any when the other of the two pigeons before 
tried was suddenly thrown into the run and fluttered 
about. 
Remarks on the Diary of the Chicks. 
Previous to writing the notes on the chicks that were 
the subject of the present paper, I had observed fowls, 
young and old, from boyhood. 
The brilliant and suggestive observations and experi- 
ments of Mr Douglas Spalding had fallen under my 
eye, and the criticism of his work by so good an 
observer as Prof. Preyer, determined me to make 
some special independent observations. 
I had the impression that Spalding’s statements 
(Macmillan’s Magazine, February 1873, referred to 
also in Romanes’ “ Mental Evolution”) were somewhat 
overdone. 
My own observations confirm that suspicion, and 
justify Preyer’s criticisms (“The Mind of the Child”), 
so that I am of opinion that Spalding’s statements 
require revision, though reliable in the main. 
Different chicks behave in a way sufficiently unlike 
to warrant differences of opinion in detail, and one 
