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, adjoining
the cages, was used exclusively for an experimental study of ideational
behavior by means of my recently devised multiple-choice method.
Additional, and supplementary, experiments were conducted in the large
cage Z. Room D served as a store-room and work-shop.

The laboratory was forty feet long, twenty-two feet wide, and ten feet
to the plate. Each small cage was six, by six, by twelve feet deep,
while the large compartment into which each of the smaller cages opened
was twenty-four feet long, ten feet wide, and twelve feet deep.



II

OBSERVATIONAL PROBLEMS AND METHODS


My chief observational task in Montecito was the study of ideational