Lee R. Dice

Laboratory Instruments for Measuring the Behavior Of Shy Or Nocturnal Small Mammals

Described are runways, remotely controlled gates, recording treadles, locking relay circuits, interval timers, and electrically operated counters and timers which are useful in the construction of experimental equipment for measuring accurately many features of the behavior of shy or nocturnal small mammals.

Modifications of behaviour associated with inherited convulsions or whirling in three strains of peromyscus

Abstract Measures of behaviour of three strains of deermice ( Peromyscus maniculatus ) which exhibit inherited types of convulsions or whirling are compared with similar measures made of a normal strain. Differences between affected and normal strains occur in the means of time taken to enter and to traverse several kinds of experimental apparatus, response time to bright light, maze learning, persistence in front of a glass barrier, and amount of spontaneous activity per unit of time. The mice of the EP strain exhibit sound-induced convulsions and also become deaf early in life. It is suggested that the inability of the adults of this strain to hear warning sounds may in part explain why they made better records than normal Peromyscus in a number of the measures. It is tentatively suggested also that a deficiency in the sense of smell leading to failure to detect warning odours may in part explain why the CV mice, which are osmogenic convulsives, made better records than normal animals for some of the measures. The tendency of the WZ mice to whirl evidently handicaps them in traversing the maze and other experimental pathways. This perhaps explains in part their poor records in some of these measures of behaviour. Their tendency to whirl may also in part explain why they respond more quickly than normal animals to the stimulus of bright light. Not all the differences between the affected and normal Peromyscus in these measures of behaviour, however, have an obvious relationship to the major defects of convulsions, deafness, defective smell, or whirling. Some of these modifications of behaviour of the abnormal strains may be due to pleiotropic effects of their major defective genes or to differences between the strains in their other genes.

Naturalist's Guide to the Americas

Facilities for research in Zoology, INVESTIGATION Embryology, Physiblogy, and Botany. Fifty-two private laborateries Entire Year

Measures of the Amount of Ecologic Association Between Species

100 each and ninety-four private laboratories

Some Factors Affecting the Distribution of the Prairie Vole, Forest Deer Mouse, and Prairie Deer Mouse

200 each for not over three months. Fifty-six tables are available for beginners in research who desire to work under the direction of members of the staff. The fee for such a table is

Inheritance of Waltzing and of Epilepsy in Mice of the Genus Peromyscus

50.00. Courses of laboratory instruction INSTRUCTION with lectures are offered in Invertebrate Zoology, Protozoology, June 28 to August Embryology, Physiology, and Morphology and Taxonomy of the 8,1927 algae. Each course requires the full time of the student. Fee,

Ability of mice of the genus Peromyscus to hear ultrasonic sounds.

75.00.