. Annual report. Entomological Society of Ontario; Insect pests; Insects. SOCIETY OF ONTARIO - 1955 59 The basic idea in the design of this installation has been to provide the means of estab- lishing and maintaining for short or long periods a uniform environment of temperature and humidity which, together with standardised techniques of application, may be reproduced at any time. Thus, provision is made for studies extending over many years, in which a known environment may need to be replicated after a long lapse of time. An example of this type of work is the study of the increased resista
. Annual report. Entomological Society of Ontario; Insect pests; Insects. SOCIETY OF ONTARIO - 1955 59 The basic idea in the design of this installation has been to provide the means of estab- lishing and maintaining for short or long periods a uniform environment of temperature and humidity which, together with standardised techniques of application, may be reproduced at any time. Thus, provision is made for studies extending over many years, in which a known environment may need to be replicated after a long lapse of time. An example of this type of work is the study of the increased resistance of organisms to chemicals, a study which is inevitably committed to the long term approach. The principal feature of the equipment is the battery of seven fumigation chambers, which is described in more detail below. Part of the installation is also illustrated in Fig. 1. These comparatively large units were adopted for several reasons which are closely tied to the status of fumigation research at the present Fig. 1. Part of fumigation installation inside insulated room Monro (4) has already pointed out the essential differences between the two types of fumigants, the so-called "space" or high pressure gases, and the low pressure vapours evolved from liquids at normal temperature. While the latter group is of great scientific interest, and holds high promise of future value to agriculture, it is with the former type that this installa- tion is primarily concerned. The chances of discovering new space fumigants of value were also discussed by Monro in the same review. It was pointed out that, while the possibility of finding new fumigants of this tvpe must not be ruled out, it is clear that the mathematical limitations imposed by the need for a molecule with few constituent atoms limits the number of prospects from the start. Also, a high percentage of candidate compounds are eliminated on account of undesirable characteristics such as instability, flammabil
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
