8 farmers' BULLETTN 603. 



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

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



DILUTING THE DIP TO FORM A BATH. 



Whatever the dip used, whether lx)iJed dip, S-B dip, or a pro- 

 prietary preparation,^ certain facts must be borne in mind and a cer- 

 tain routine followed in preparing baths for dipping. ^Vll concen- 

 trated arsenical preparations are considerably heavier than water, 

 and unless properly introduced into the dipping vat tend to mak^ 

 their way to the bottom, after which it is difficult to get an even mix- 

 ture. In preparing a diluted bath it is necessary first to fill the vat 

 with water, leaving just enough space below the full water line for 

 the necessary volume of concentrated dip. Then the desired amount 

 of concentrated dip is to be poured in a thin stream evenly all over 

 the surface of the water — except, of course, at the shallow exit end 

 of the vat — after which a few minutes of brisk stirring will make 

 certain that the bath is of uniform strength throughout. If tar 

 stock is used, as in the case of the S-B dip, the tar stock is to he added 

 before the arsenic stock and may be put in when the vat is about 

 three-fourths filled with water. Tar stock should always be mixed 

 with two or three times its volume of water before being added to 

 the vat. 



The dilutions at which the various concentrated stocks will be used 

 are as follows: 



Boiled arsenic stock, containing either 8 pounds (low strength) oi- 

 10 pounds (high strength) white arsenic in 25 gallons, for the cor- 

 responding strength bath, 1 gallon added to every 19 gallons water 

 (2^ pints to 6 gallons). 



S-B arsenic stock, containing 10 pounds white arsenic in 5 gallons, 

 for low-strength bath 1 gallon added to every 121 gallons wafer 

 (5i fluid ounces to 5 gallons) ; for high-strength bath add 1 gallon 

 to every 99 gallons of wat^r (C| fluid ounces to 5 gallons). 



Tar stock, for both low-strength and high-strength baths, 1 gallon 

 added to every 300 gallons of finished bath (2 fluid ounces, or 4 

 tablespoonfnls, to 5 gallons). Mix the tar stock with two or tlu'eo 

 times its volume of water before adding to the vat. A certain lati- 

 tude in tlie amount of tar stock used is permissible, but it is believed 

 that the above proportions will be found most satisfactory. 



REPLENISHING THE BATH AND CORRECTING ITS STRENGTH. 



As (lipiiiiiK Roes on. the bath will natunilly iieel replenlehinp. In addition 

 Its strength will i)i(ibal)l.v u»'ed correction from time to time. The cauHe« which 

 may lead to chauKcs in the shciiiu'th of urseuical baths, together with uieth<Ki.s 



' Tl is viT.v lllu'Iy tlint (lie lnir.au will Ishuo pcrmlsMloii for i-crtMin proprlt-tnr.v prcpii- 

 ratloHH to lie tiHcd l:i oindnl dipping'. .\n.v such piodiicl will brnr a stuloniput on tlio 



label tn (1 fTc'ct lli.it lln' iit-odiict Ims I>i>cn (>\nmInod l).v (lie liuromi ntid has been por- 



mltlfd for iiKi- 111 ollliliil dlpplnu iit a j-lvcn dllutlDii. 



