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1 From the Burroughs Wellcome and Co., U. S. A. Experimental Research Laboratories, Tuckahoe, New York
A statistical analysis was made of the influence of various factors on the duration of hypnosis in the albino mouse.
Over a period of about a year and a half, broad chronological subgroupings were found, lasting for months at a time, in which sleeping-times of similar length were observed.
No significant diurnal variations were encountered.
The length of sleeping-time was found to increase, in approximately linear fashion, with increased barometric pressure.
Shorter sleeping-times were experienced with higher wet-bulb or dry-bulb temperatures.
When the duration of hypnosis was less than about one hundred and ten minutes, shorter sleeping-times were associated with higher relative humidity values.
The existence of an association or relationship as determined above, does not imply cause and effect.
Submitted on December 3, 1938