I have read with much interest a couple of papers by Mr. Hanham, of Winnipeg, on the capturing of insects “at light.” I had adopted this method in the Old Country with much success, and last season in this district, near the head of Lake Manitoba, I employed the same means and secured a goodly number of specimens. There is no doubt that light is most efficacious in securing to the one who makes use of it many insects that would otherwise be only rarely met with, but while engaged in thus making cautpres one cannot help being struck–a point to which Mr. Hanham alludes–with the effect light has upon many of the Lepidoptera, or rather with the different effects it has upon different individuals.