. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. which give trouble later. Next all nests should be treated to cyanide of potassium when found. This is a deadly poison, but it is very effectual in stamping out Wasp-colonies. loz. of cyanide to half a pint of water will make a solution of sufficient strength. In this should be dipped something fairly absorbent— a piece of flannel—and this should be thrust well down the hole in the evening, when most of the Wasps are at home. Many other mixtures are advocated, but none are so effective as cyanide of potassium, which
. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. which give trouble later. Next all nests should be treated to cyanide of potassium when found. This is a deadly poison, but it is very effectual in stamping out Wasp-colonies. loz. of cyanide to half a pint of water will make a solution of sufficient strength. In this should be dipped something fairly absorbent— a piece of flannel—and this should be thrust well down the hole in the evening, when most of the Wasps are at home. Many other mixtures are advocated, but none are so effective as cyanide of potassium, which the gardener must take care not to inhale. In fruit-houses, despite every precaution, Wasps manage to gain an entrance. If, however, a wide-mouthed bottle containing some syrupy liquid be hung in the vicinity of the ripening fruits, the Wasps are almost certain to be attracted thither, and be caught. Outdoors it will also pay to hang similar bottles in the trees. There are yet other Wasps which are of the greatest service. Those, however, are Solitary, and are popularly known as Sand - Wasps. There are a number of species, all of which are smaller than their Social relatives, while the body is far more peg-top like. These are all carnivorous, and collect vast numbers of injurious cater- pillars, &:c., which, after paralysing them, they take' to their underground nests to furnish the young with food. Weevils.—Belonging to several families of the Rhyiicophora are three or four species more than ordinarily destructive, and popularly described as Weevils, a name which by coleopterists is reserved for the CurculionidcE alone. The leading characters of the group are the prolongation of the head in front to form a snout or beak, and the four-jointed tarsi. The species calling for mention here by reason of their omnivorous propensities and their abundance are the Black Vine Weevil (Otior?-hynchus suicatiis, Fig. 710), Apricot Weevil {O. tene- bricosiis, Fig. 711), Clay-colour
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