1909.] PUBLIC DOCUMENT — No. 31. 49 



Figs. 1 and '2). The flexible tube allows an easy adjustment, 

 by Avbicli means the formalin drip can be directed wher- 

 ever needed. The shape of the tank is triangular in cross- 

 section and it is constructed so as to be about half an inch lower 

 in the center of the bottom, where the drainage tube is attached, 

 than elsewhere, so that it is easily emptied. 



From repeated trials of this machine it is found lliat the flow 

 of the tank is nniform, and when the valve is ])roperly adjusted 

 no further adjustment is necessar3^ The tank is held in place 

 by iron bands fastened to the woodwork. A immber of onion 

 growers who have been troubled with smut have treated their 

 seeds with formalin the past year or two, and our seed sower, 

 wuth the formalin drip attachment, was loaned to those who 

 wished to try it, with very favorable results. 



It is necessary to use oidy a small quantity of formalin, — 

 just enough to wet the seeds and a portion of the soil one inch 

 or so either side of the line formed by the seeds. We found by 

 actual experiments that 1 gallon would cover about 1,000 feet 

 in length of drill. The strength of formalin employed for this 

 pnrjDose is 1 pound (pint) of commercial formalin to 30 gal- 

 lons of water (1 part to 240), or 1 ounce of formalin to 1 gal- 

 lon of water (1 part to 128). Some have used 2l/o quarts of 

 formalin to 50 gallons of water (1 i3art to 80). 



