Showing papers in "Journal of Comparative Psychology in 1934"

Visual acuity and its relation to brightness in chimpanzee and man

Abstract: Visual acuity was determined by having the subjects differentiate (the adults by indicating verbally and the chimpanzee and children by opening a food box) between a striated and a plain field. The striated and non-striated fields were presented by means of Ives gratings, the gratings being at a suf

Experimental studies, old and new, on menstrual toxin.

Abstract: Scientific investigation on menotoxin or menstrual toxin started around 1920. Since then a number of zoopharmacological reactions and a number of phytotoxic effects of menotoxin have been described. It has been shown for example that injections of menotoxin have a markedly depressant effect on albino rats that large doses of menotixin can depress the muscular contractions of vas deferentia in rats and that menotoxin solutions when applied to the sciatic nerves of rats greatly increase their irritability. Research on the chemical nature of menotoxin have brought it into close touch with the chemistry of toad poisons closely related in their nature to oxycholestrin and to certain heart drugs.