By the aid of certain devices, formalin can be easily and cheaply 

 applied when the seed is sown. Tests have shown that about 1200 

 feet of drill can be treated with one gallon of formalin solution. One 

 of the first devices used for this purpose was made by the writer, and 

 consists of a tank attachment. At the bottcjm is fastened a block tin 

 tube about a quarter of an inch in diameter, to which is attached a 

 valve to regulate the flow of the formalin, and as the tube is flexible 

 and at the same time more or less rigid, it can be bent in any posi- 

 tion desired and held securely. The tank, which holds one gallon, 

 may be attached to any onion sower (see fig. i) by means of strips 

 of iron. Although not fastened to the iron frame, the tank stays in 

 place and can be easily removed. 



Fig. 2. Formalin tank, block tin 

 pipe and valve. (See Fig. i.) 



In figure 2 the tank and tube are shown detached from the sower. 

 A special feature of the tank consists in the ease with which it can 

 be drained, the middle of the tank being lower than the ends. A 

 larger tank may be used if necessary, as the weight t)f the formalin 

 is not enough to affect the easy handling of the machine. The flow 

 of the formalin solution in a tank of this shape is nearly uniform, 

 there being little ditTerence in the amount flowing when the tank is 

 full and when nearly empty. 



