er perfect ability
to differentiate.

I next questioned her on more practical subjects. I said: "What is the
colour of the stove in this room?" at the same time looking out of the
window to make sure that she knew what a "stove" was. "Green," was her
answer--and quite right too, for the stove is built of green porcelain
tiles. I asked her a few more questions relating to flowers and to
articles in daily use until I had no further doubt as to her being
competent to tell one colour from the other. Coming generations may,
perhaps, laugh at these numerous tests, instead of crediting animals
with this ability as a matter of course!

HER PERFECT SENSE FOR SOUND

In my quest for further tests as to canine abilities, the idea occurred
to me that it might be as well to arrive at a greater degree of
certainty with respect to sound, that is, inquiring into a dog's memory
for sound, and their powers of differentiating one tune from another.
In the case of my old dog, I had already observed many things such as
inclined those to whom I had related my experiences, to be of opinion
that these had to do with the dog's ear. For instance, if I had been
away, and returned (either driving or on foot), conversing in low tones
with another person, this dog would _scream_ for joy. His voice on such
occasions was of quite a special quality, and everybody about the
court-yard knew that I must have already passed the tree known as the
"Abend Eiche," which stands some hundred metres distant, and the dog
was always at that time confined, though in the open. Our conversations
on such occasions were always quiet ones, and yet the dog recognized my
voice at a distance of a hundred metres. If I happened to return alone
and on foot, after an absence of about two days, his cries would start
when I had reached _half that distance_--therefore, at fifty
metres--and Lola would then also hear my step. And here is another
example--one about which I was at first doubtful, not knowing to which
sense it should be attributed. I always knew from Lola when I might
expect a certain friend of mine--a friend to whom, by the way, she was
really more attached than to me! I used to know by the heavy raps of
her tail against the floor. The room in which we would be at such times
was on the second floor and lay towards the front of the house. But
when those anticipatory raps began my friend was still on her way,
coming by a path which lay in the rear of the house