42 REPORT ON INJURIOUS INSECTS FOR 1906. 



INSTRUCTIONS FOR USING BISULPHIDE OF CARBON. 



The fumes of this chemical, in addition to being deadly poison to 

 all animal life, are also highly inflammable. No light such, for 

 instance, as a lighted cigar or pipe should be brought near it, nor 

 should it be used where there are electric wires. 



For fumigating stores it is best used in a large air-tight tin, into 

 which the goods are placed, and then pour the bisulphide into a saucer 

 placed upon the goods in the proportion of one pound (i Ib.) to every 

 thousand (1,000) cubic feet of space. The liquid should be poured 

 out quickly in order not to inhale the fumes there is no danger in 

 inhaling a small quantity and the bin closed and kept shut for at 

 least five hours, after which time it should be well ventilated, as also 

 the fumigated goods. 



APPENDIX B. 



For the benefit of those possessing no special knowledge of Ento- 

 mology, it may be well to point out that, with a few exceptions, all 

 insects are hatched from eggs. From the eggs, the larvae or cater- 

 pillars hatch out, and after a time these change into pupae or chrysa- 

 lides, each ultimately developing into an imago. 



The Eggs. These are exceedingly variable in shape, size, and 

 colour. They may be laid singly or in groups. Sometimes they are 

 protected by a gummy secretion, whilst others are fastened by a short 

 thread. The food of the young in nearly all cases determines the 

 place where the eggs are deposited, such, for instance, as on leaves, 

 close to or in roots, in blossom buds, beneath the bark of trees, on 

 cattle, meat or decaying animal or vegetable matter. The number of 

 eggs laid by a single insect may be very few or many thousands ; 

 fifty to a hundred, however, may be taken as an average. The period 

 of hatching, generally speaking, is not of long duration, though there 

 are cases wjiere they remain unhatched for a considerable length of 

 time. 



The Larva. In a few cases this is produced alive, but usually it 

 is hatched from an egg. The larvae of Butterflies, Moths, and Sawflies 

 are commonly spoken of as caterpillars, those of Beetles as grubs, 

 while those of Flies are known as maggots. 



If a larva possesses legs, the first three segments behind the head 

 each carry a pair, which are jointed and known as thoracic or true 

 legs. Legs may also be present on the posterior segments, but these 

 are never jointed ; they are known as pseudopods or prole gs. 



It is often very difficult to say exactly to what particular order 



