1897.] PUBLIC DOCUMENT — No. 33. 43 



It has been claimed by Griffiths that the use of this salt 

 favors chlorophyll formation, and that it therefore causes a 

 perceptibly deeper shade of green in the leaves in the plants 

 to which it is applied. No difference could be detected dur- 

 ing the season. The average crop (cut green for the silo) 

 where the sulphate of iron was applied was 462i pounds, 

 the average of the other plats 445 pounds, — a difference of 

 17^ pounds in favor of the treatment, or at the rate of 525 

 pounds per acre. I consider this difterence too small to be 

 of much significance. 



" Bug Death." 

 This is a preparation sent to us by the Danforth Chemical 

 Company, Leominster, Mass., as a substitute for Paris green 

 as a poison for potato bugs and as a preventive of blight. 

 It was received late in the season, the "bugs" being full 

 grown when we were able to use it the first time. It kills 

 them, but not as quickly as Paris green ; and as, in showery 

 weather particularly, rapidity of action is desirable, I do 

 not look upon it as equal in value to that poison for this 

 and similar purposes. The " Bug Death " had no apparent 

 effect in preventing blight. 



Atomizer for applying the Bur/ Death. 

 The Danforth Chemical Company sent with the "Bug 

 Death" a large atomizer, which they recommended for its 

 application. This material and similar dry poisons can be 

 applied with this atomizer, but it is entirel}^ unsuited to use 

 upon a large scale. The hand soon becomes excessively 

 and painfully weary from the motion required, while the 

 time occupied is far greater than b}^ other means which are 

 Avithin the reach of all. It required twenty-eight minutes 

 to cover a row with the atomizer, while the same length 

 of row was covered by the use of Leog-ett's sun in eioht 

 minutes. 



■ FUNGIROID. 



"Fungiroid," sold by the manufacturers of Leggett's dry 

 insect powder gun as a means of preventing potato blight, 

 has been given a thorough trial. Both the " Fungiroid" in 

 combination witli Paris green ^ furnished and recommended 

 by the company, and in the latter part of the season, when 



