8 FARMEES BULLETIN 856. 



the stickj^ soap is dissolved. This soap can be purchased of most 

 dealers in garden supplies. 



CARBOLIC-ACID EMULSION. 



Carbolic-acid emulsion is a good remedy for certain root feeders, 

 such as root-maggots, Avhich are injurious to onions, cabbages, tur- 

 nips, beans, and similar plants, to protect against the fl}^ or adult de- 

 jDositing eggs. Its value for other purposes is somewhat limited. It 

 is prepared by mixing half a pound of soap in half a gallon of water 

 and 1 quart of crude carbolic acid, or phenol, and is then diluted with 

 about 25 parts of water. It should be applied a da}'' or two after the 

 plants are up, and, in the case of transplanted crops, a day after they 

 are transplanted, and should be repeated if necessary. 



Carbolic acid acts as a repellent and is a contact and stomach 

 poison. It is corrosiA-e and should be handled with care. 



CORROSIVE SUBLIMATE (MERCURIC CHLORID). 



Mercuric chlorid (corrosive sublimate) is used for treating seed 

 potatoes and cabbage seed for diseases. It may be purchased at 

 drug stores in the form of tablets costing about 25 cents for 24. 

 Dissolve tw^o large tablets in a quart of water to make a 1 to 1,000 

 solution. For larger quantities use 2^ ounces to 15 gallons of Avater. 

 Corrosive svMimafe is a deadly poison. It attacks metals and there- 

 fore-must be used only in a Avooden, glass, or earthenware vessel. 



FORMALDEHYDE (FORMALIN). 



Formaldehyde (formalin) is used for treating seed potatoes, seeds, 

 and soil, to pre\"ent diseases. This is a clear solution of 40 per cent 

 formaldehyde gas in Avater, wdiich retails at about 50 cents per pint. 

 It is very irritating to the eyes and to cuts, but not poisonous. It 

 does not attack metals. Use 1 teaspoonful to a. teacup ful of Avate 

 1 ounce to 2 gallons of water, or 1 pint or pound to 30 gallons of 

 Avater (for potatoes and onions). It is not an insecticide. 



KEROSENE EMULSION. 



Kerosene-soap emulsion is a remedy for most sucking insects. 



This is made by combining 1 gallon of kerosene and one-fourth 

 pound of laundiy soap, or 1 pound of whale-oil (fish-oil) or other 

 soap, or 1 pint of soft soap, Avith half a gallon of Avater. The laundry 

 soap, if dry, is shaA'ed and dissohed in boiling water and then poured 

 (away from the fire) while still boiling hot into the kerosene. The 

 mixture is then churned rapidly 8 or 10 minutes, the liquid being 

 pumped back upon itself by means of a sprayer with a nozzle throw 

 ing a strong, solid stream. At the end of this time the mixture has 

 become a thick cream — the stock emulsion. In the preparation of the 

 emulsion a sprayer is a necessity, since if it is not made as directed a 

 perfect emulsion Avill not be formed. If properly prepared, this stock 

 emulsion Avill keep thi-ough a season and is to be diluted only as 



