. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 56 THE REPORT OF THE Carbon tetrachloride is used as a killing agent. Underneath the lowest tray there is a layer of cotton wool which covers the bottom of the trap. The tetrachloride is poured on it until the cotton is saturated with the fluid. In addition to this, to se- cure uniform distribution of the gas, each tray carries a small tin container filled with absorbent cotton and covered with a perforated lid. Tetrachloride is also poured into these. The tins may be placed either in t
. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 56 THE REPORT OF THE Carbon tetrachloride is used as a killing agent. Underneath the lowest tray there is a layer of cotton wool which covers the bottom of the trap. The tetrachloride is poured on it until the cotton is saturated with the fluid. In addition to this, to se- cure uniform distribution of the gas, each tray carries a small tin container filled with absorbent cotton and covered with a perforated lid. Tetrachloride is also poured into these. The tins may be placed either in the centre or to one side of the trays. The latter arrangement will offer less obstruction to the insects falling into the trap. A small ring soldered to the centre of each tray will be useful in lifting out the screens. Carbon tetrachloride stupefies the insects almost instantaneously, but the specimens killed by it need to be thoroughly relaxed before they can be pinned. This excessive stiffening is the principal objection to tetrachloride as a killing agent. It is necessary to renew the gas supply every night; % of a gallon of tetrachloride, ii judiciously used, will suffice for one season. The accompanying drawing, prepared by Mr. H. A. Gilbert, supplements the details of construction lacking in the present Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of Ontario; Ontario. Department of Agriculture. Toronto, The Society
Size: 4084px × 612px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
