T :i-i E o c c u R R E N C E Of late sequelae t o insecticide poisoning by the cholinesterase inhibitors and the chlorinated hydrocarbons has yet to be fully evaluated. Almost no attention has been given to this possibility in children who might, because of developmental immaturity, be particularly susceptible to neurologic sequelae. During the years from 1952 to 1963, 31 children, aged 11 months to 6 years, were hospitalized at Children's Memorial Hospital, Omaha, with acute insecticide poisoning. Chlorinated hydrocarbons were responsible for 19 exposures; 4 of the 5 children exposed to concentrated solutions (above 5 per cent) had convulsions; 3 of the 19 had other central nervous system symptoms. Convulsions also occurred in the one child exposed to diazanon. The 11 miscellaneous