I. Test procedure involves determining mosquito biting frequency (bites per min. on untreated areas) during the test period and observing the repellent protection time (time in minutes to the first bite on corresponding treated areas). With an increase in biting frequency there is a decrease in repellent time. For rating purposes, a product developed during the repellent investigation is used as a reference standard and the repellent time of any compared substance is divided by the repellent time of the reference standard obtained at the same biting frequency. If the compared product is tested at several biting levels, the ratings at the different levels are averaged to give a. single comparative figure.[long dash]II. As a result of a study of nearly 1000 materials for possible mosquito repellent properties, a repellent product (Sta-Way Insect Repellent Lotion) was developed, the active ingredients of which are diethylene glycol monobutyl ether acetate and diethylene glycol monoethyl ether. This mixture proved superior to any of the usable, available chemicals and mixtures of them, and to 42 representative proprietary products, when tested against mosquitoes and other bloodsucking pests such as black flies, sand flies, stable flies, deer flies and chiggers. This repellent product was proved superior in its combination of accessory properties such as pleasing odor, lack of irritation, toxic effects or unsightly appearance when applied to normal skin and its harmlessness to all fabrics except acetate rayon.