FUNGICIDES. 359 



mixture, will generally be preferred for use upon plants in 



the greenhouse, as they are less unsightly. Various othei 

 mixtures have been used for the destruction of fungous dis- 

 eases, but none of them are as valuable as those described 

 aboye. We have also had fair results from the use of a 

 solution of copper sulphate, which is easily prepared and 

 is quite inexpensive. We have used it at the rate of one to 

 one thousand, or of one ounce to eight gallons of water, 

 upon most plants, but in the case of the beet, bean, and 

 other plants with smooth leaves, the strength should be 

 reduced; for some plants, like the carnation, it can be 

 doubled to advantage. To be effectual, soft water 

 should be used in making the solution. 



WHITE AESENIO. 



Good results from the use of a solution of arsenic, 

 as a remedy for the rust of the carnation, are reported 

 by E. G. Hill and others. If only a few plants are 

 grown, it will be best to buy "Powlei-'s solution" of 

 arsenic at a drug store, and use it at the rate of an ounce 

 to eight gallons of water. With a little care, a solution 

 can be readily made. The following formula is recom- 

 mended: Take of arsenious acid 0. P., 616 grains; 

 bicarbonate of potash, 1336 grains; water, four ounces. 

 Heat until a solution has been made and add enough 

 water to make five ounces by measure. Use one ounce 

 of the solution to eight gallons of water. Care should 

 be taken not to inhale any of the vapor when making 

 the solution. A thorough application seems to kill the 

 spores and the body of the fungus, and at the same 

 time causes the injured leaves to drop off, thus cleaning 

 ap the plants. 



