Materials and Formulas. 147 



serious injury, undoubtedly due to the fact that the poison is 

 not washed off, but remains to burn the foliage. The addition 

 of lime to the mixture would probably be beneficial. 



FOSTITE. See SULPHOSTEATITK. 



FUMA. A form of carbon bisulphide, which see. 



GAS TREATMENT. See HYDROCYANIC ACID GAS. 



GLUE. Glue is frequently recommended as a valuable addi- 

 tion to insecticides and fungicides; it is supposed to increase 

 their adhesive properties, and probably does so to a limited ex- 

 tent. In general practice its use is unnecessary, but in case 

 liquids do not adhere to foliage when the application is first 

 made, the addition of some cheap glue, used at the rate of 1 

 pound to 50 gallons of liquid, may prove of value. 



GLUE AND ARSENITES. 



Common glue 1 pound. 



Paris green 1 ounce. 



Hot water 2 gallons. 



The glue is first dissolved in hot water, after which the 

 Paris green is stirred in, and the remainder of the water added. 

 This is said to be of value in protecting trees from borers, but 

 the applications may cause serious injury, and the remedy should 

 be used cautiously. The mixture may also be used upon foliage, 

 in which case dilute with about 15 gallons of water. 



GRISON LIQUID ; EAU GRISON ;. SULPHUR AND LIME MIX- 

 TURE. For the original formula of this liquid, see page 10. 

 It is at present commonly made by using 



Flowers of sulphur 3 pounds. 



Quicklime 3 " 



Water G gallons. 



These should be boiled until the amount of liquid is reduced 

 to 2 gallons. It should then be allowed to settle, and the clear 

 liquid be drawn off and tightly corked in bottles. Dilute with 

 100 parts of water before using. The preparation is particu- 

 larly valuable in treating the European mildew of the grape, 

 and also for use against various mildews which attack plants 

 grown under glass. See, also, LIME SULPHIDE. 



GYPSINE. See ARSENATE OF LEAD. 



