26 Farmers' Bulletin 1057, 



Tar stock is prepared thus: 



In a large metal pail dissolve three-fourths of a pound of caustic 

 soda in 1 quart of Avater, add 1 gallon of pine tar, and stir thoroughly 

 with a wooden paddle until the mixture, which at first looks streaked 

 and muddy, brightens to a uniform, thick fluid somewhat resembling 

 'molasses. Test it by letting about a teaspoonful drip from the pad- 

 dle into a glass of water (a glass fruit jar or a wide-mouth bottle will 

 do) and stirring thoroughly with a sliver of wood. It should mix 

 perfectly with the water. Globules of tar which can be seen by 

 looking at the glass from underneath and which can not be blended 

 with the water by repeated stirring indicate that more caustic-soda 

 solution is needed. In that case make up more caustic-soda solution 

 of the same strength and add it, not more than a pint at a time, with 

 thorough stirring, until the desired effect is produced. 



If an appropriate glass vessel for making the test is not at hand, 

 take a little of the mixture between the fingers, then dip the fingers 

 under water and try to rub off the tar. It should leave the fingers 

 perfectly clean after a little rubbing with water. If an oily coating 

 remains, more caustic-soda solution is needed. Such an extra addi- 

 tion of caustic soda will be required only in case of a very low-gi-ade 

 chemical or a very highly acid tar. The tar stock should be kept in 

 closed containers, such as a pail with a friction top. 



The quantity of S-B arsenic stock or of tar stock made in one 

 operation can be varied as desired, provided the above-given pro- 

 portions of the ingredients are adhered to. But one should attempt 

 to work the S-B formula on a larger scale only after skill and 

 experience have been acquired. 



-&^ 



MAKING THE BOILED DIP. 



. The boiled dip is less convenient than the S-B dip, but the final 

 composition and effect of dipping baths prepared from the two is the 

 same. 



To make a 500-gallon bath provide: 



Sal-soda crystals . 24 pounds. 



White arsenic 8 pounds. 



Pine tar 1 gallon. 



Put 25 gallons of water into a kettle or tank of from 40 to 50 gal- 

 lons" capacity, heat to boiling, and add the sal soda. When this has 

 dissolved add the white arsenic, then boil and stir for 15 minutes or 

 longer, until the white arsenic has entirely disappeared. If intended 

 for immediate use cool to 140° F. (by addition of cold water if 

 desired), then pour in the pine tar in a thin stream while constantly 

 and vigorously stirring the solution. Immediately empty the licpiid 

 into the dii)ping vat, which has already been thi-ec-fourths filled 

 with water, and stir thoroughly. V 



