hold its position. Tlie 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. 



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 of 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 difference in the amount flowing when the tank is full and when 

 nearly empty. 



Fig. 3. Horse-shoe form of tank. A tank similar to tliis might be readily adapted 

 to any two-row seed sower. 



Figures 3 and 4 show more recent devices of this nature. The 

 tanks are in both cases made of galvanized iron and have a capacity 

 of two gallons. An improvement over the earlier apparatus consists 

 in an iron rod attached to the valve and leading to the handles of the 

 sower, by means of which the operator can adjust the flow at will. 

 The horse-shoe form of tank shown in figure 3 has the largest use in 

 the Connecticut valley. 



In the treatment of onion smut only enough liquid need fall to cover 

 the seed and moisten a little of the surrounding soil. 



Very satisfactory results have been noted from the use of the for- 



