tails aloft? How is this with the rhinoceros? Do not trouble yourself to
answer this, but I shall be in London in a couple of months, and then
perhaps you will be able to answer this trifling question. Or, if you
write about wolves and jackals turning round, you can tell me about the
tails of elephants, or of any other animals. (466/2. In the "Expression
of the Emotions," page 44, reference is made under the head of "Associated
habitual movements in the lower animals," to dogs and other animals turning
round and round and scratching the ground with their fore-paws when they
wish to go to sleep on a carpet, or other similar surface.)


LETTER 467. TO A.D. BARTLETT.
Down, January 5th, [1871?]

Many thanks about Limulus. I am going to ask another favour, but I do not
want to trouble you to answer it by letter. When the Callithrix sciureus
screams violently, does it wrinkle up the skin round the eyes like a baby
always does? (467/1. "Humboldt also asserts that the eyes of the
Callithrix sciureus 'instantly fill with tears when it is seized with
fear'; but when this pretty little monkey in the Zoological Gardens was
teased, so as to cry out loudly, this did not occur. I do not, however,
wish to throw the least doubt on the accuracy of Humboldt's statement."
("The Expression of the Emotions in Man and Animals," 1872, page 137.)
When thus screaming do the eyes become suffused with moisture? Will you
ask Sutton to observe carefully? (467/2. One of the keepers who made many
observations on monkeys for Mr. Darwin.) Could you make it scream without
hurting it much? I should be truly obliged some time for this information,
when in spring I come to the Gardens.