rtie made
a great fuss, jumping about excitedly and uttering plaintive cries when
she discovered that her mate was gone. Whenever I approached her cage
she scurried into the shelter box and stayed there while I was near.
This behavior I never before had observed. It continued for two days. On
April 2, it was noted that she had lost her recently acquired shyness
and she no longer made any attempts to avoid me. As usual, on this date,
she was carrying the remnant about with her.

"The following day, April 3, Gertie was lured from her cage to a large
adjoining compartment for certain experimental observations. After she
had been returned to her own cage the remnant was noticed on the floor
of the large cage. I picked it up. Gertie evidently noticed my act; for
although at a distance of at least ten feet from me, she made a sharp
outcry and sprang to the side of the cage nearest me. I held the piece
of skin (it looked more like a bit of rat skin than the remains of a
monkey) out to her and she immediately seized it and rushed with it to
the shelf at the top of the cage.

"Two days later the remnant was missing, and careful search failed to
discover it in the cage. It is probable that Gertie had carelessly left
it lying on the floor whence it was washed out when the cages were
cleaned. On this date Gertie seemed quieter than for weeks previously.

"Thus it appears that during a period of five weeks the instinct to
protect her offspring impelled this monkey to carry its gradually
vanishing remains about with her and to watch over them so assiduously
that it was utterly impossible to take them from her except by force.

"After reading this note in manuscript, Doctor Hamilton informed me that
Gertie had behaved toward her first still-birth as toward her second.
And, further, that Grace, a baboon, also carried a still-birth about for
weeks.

"I am now heartily glad that my early efforts to remove the corpse were
futile, for this record of the persistence of maternal behavior seems to
me of very unusual interest to the genetic psychologist."

_Fear_

In connection with the multiple-choice experiments Skirrl exhibited what
seemed to be instinctive fear as a result of his unfortunate experience
with nails in the floor of box 1. He seemingly referred his misadventure
to some unseen enemy under the floor, and this in spite of the fact that
he was given abundant opportunity to examine the floor of the box, but
not until afte