Abstract
(1) Coal-tar phenols are useful intermediate solvents for making solutions of rotenone in both mineral and vegetable oils.(2) Medium petroleum oil showed superiority to ground-nut oil as a carrier of rotenone in xylenol tested against Ornithodorus moubata.(3) The solutions of rotenone in xylenol and oil showed no deterioration after storage in the dark at room temperature for six weeks.(4) In these solutions rotenone proved far less toxic to Ornithodorus moubata than an equal weight of pyrethrin I in medium petroleum oil.