ated a large mass of the most valuable and interesting
observations on the behavior of monkeys, and he more thoroughly
understands them than any other observer of whom I have knowledge. Much
to my regret and embarrassment in connection with the present report, he
has thus far published only a small portion of his data (Hamilton, 1911,
1914). In his most recent paper on "A study of sexual tendencies in
monkeys and baboons," he has given important information concerning
several of the monkeys which I have observed. For the convenience of
readers who may make use of both his reports and mine, I am designating
the animals by the names previously given them by Hamilton. The
available and essential information concerning the individuals is
presented below.

_List of animals in collection_

Skirrl. _Pithecus irus_. Adult male.

Sobke. _P. rhesus_. Young adult male.

Gertie. _P. irus-rhesus_. Female. Born November, 1910.

Maud. _P. rhesus_. Young adult female.

Jimmy II. _P. irus_. Adult male.

Scotty. _P. irus_ (?). Adult male.

Tiny. _P. irus-rhesus_. Female. Born August, 1913.

Chatters. _P. irus_. Adult eunuch.

Daddy. _P. irus_. Adult eunuch.

Mutt. _P. irus_. Young adult male. Born August, 1911.

Julius. _Pongo pygmaeus_. Male. Age, 4 years to 5 years.

When I arrived in Santa Barbara, Doctor Hamilton was about to remodel,
or rather reconstruct, his animal cages and laboratory. This gave us
opportunity to adapt both to the special needs of my experiments. The
laboratory was finally located and built in a grove of live oaks. From
the front it is well shown by figure 10 of plate III, and from the rear,
by figure 11. Its location was in every way satisfactory for my work,
and in addition, the spot proved a delightful one in which to spend
one's time.

[Illustration: FIGURE 12.--Ground plan of Montecito laboratory and
cages. Scale 1/120

L, laboratory; C, cages; A, experiment room in which multiple-choice
apparatus was installed; B, E, additional rooms for research; D, store
room and shop; Z, large central cage communicating with the eight
smaller cages 1-8.]

Figure 12 is a ground plan, drawn to scale, of the laboratory and the
adjoining cages, showing the relations of the several rooms of the
laboratory among themselves and to the nine cages. Although the
construction was throughout simple, everything was convenient and so
planned as to expedite my experimental work. The large room A, adjoin