WAYS OF NATURE 
we need not be surprised to meet a winged horse, or 
a centaur, or a mermaid at any time. 
It is as plain as anything can be that the animals 
share our emotional nature in vastly greater mea- 
sure than they do our intellectual or our moral 
nature; and because they do this, because they 
show fear, love, joy, anger, sympathy, jealousy, 
because they suffer and are glad, because they form 
friendships and local attachments and have the 
home and paternal instincts, in short, because their 
lives run parallel to our own in so many particulars, 
we come, if we are not careful, to ascribe to them the 
whole human psychology. But it is equally plain 
that of what we mean by mind, intellect, they show 
only a trace now and then. They do not accumulate 
a store of knowledge any more than they do a store 
of riches. A store of knowledge is impossible with- 
out language. Man began to emerge from the lower 
orders when he invented a language of some sort. 
As the language of animals is little more than vari- 
ous cries expressive of pleasure or pain, or fear or 
suspicion, they do not think in any proper sense, 
because they have no terms in which to think — no 
language. I shall have more to say upon this point 
in another chapter. One trait they do show which is 
the first step toward knowledge — curiosity. Nearly 
all the animals show at times varying degrees of 
curiosity, but here again an instinctive feeling of 
possible danger probably lies back of it. They even 
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