Abstract
Cyanogenetic glycosides were found to be present in the leaf, bark and fruit of eight species of Cotoneaster. A quantitative determination of cyanogenetic material was made on the leaf, bark and fruit of C. divaricate at three different periods in the growing season. The leaf was found to have the greatest percentage of cyanogenetic glycosides and the fruit the least. Seasonal variation was found to be greatest in the fruit where it was demonstrated that the cyanogenetic content decreased as the fruit aged. Toxicity of the fruit of C. divaricata was studied in the dog, cat and rat. On the basis of the cyanogenetic glycoside determinations and the toxicity studies it was concluded that classification of these eight species of Cotoneaster as poisonous was not warranted.
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