- xo - 
promising against certain aphids and the onion thrips. It acted slow^ 
ly against the Mexican bean beetle and was considei^ably repellent so 
•that there was little feeding.— ■Anonymous (_8) • 
An inseoticidal principle possibly is present in the castor^ 
bean plant only under certain conditions with respect to variety, 
cultural practice, and enTironment* It would appear that the accepted 
use of the castor-bean plant as a soxirce of insecticide awaits the ^ 
isolation, identification, and methods of analysis of the specific 
substances toxic to insects*— 'Haller and Hclndoo (25) • 
