Fifteen apparent errors of observation, reporting, interpretation, or attribution occurring in the insect repellent and attractant literature were examined. Topics discussed are the boiling point effect, solvents and solutions, repellent-treated netting, terpineol and diphenyl oxide, lactic acid, the smell and feel of deet (diethylmethylbenzamide), effective half-life, protection time, protection time of deet for men and women, McGuire's formula, "plussing out", King's classification, exorbitant doses, extrapolated doses, and extreme observations. The decay constant (1.36 hr-1) and half-life (0.51 hr) of a mosquito-repellent bath oil (Skin-So-Soft) are reported for the first time. [References: 85]