THE AMERICAN ENTOMOLOGIST. 



189 



"This machine makes a remarkably fine spray, 

 but it possesses the same disadvantage as tliose 

 already mentioned, namely, the ease with which 

 the nozzles clog, notwithstanding the receiving- 

 pipe of the pump is provided with a strainer. 

 This I found to be a serious drawback, requiring 

 frequent stopping of the driver and his dismount- 

 ing to remove, cleanse, and readjust the plugs. 

 The .iddition of the self-acting pitman has proved 

 less useful than one would suppose, for Judge 



" The following machines produce the spray on 

 a quite different principle and one much better 

 calculated to prevent clogging. They are all 

 recently invented, and by virtue of their decided 

 advantages will, in my judgment, supersede those 

 hitherto mentioned. They do not clog up ; they 

 distribute the spray over more rows of cotton, 

 and they are simpler in construction, and cheap- 

 er." 



(To be continued,) 



[Fig, 98.] 



Johnson himself writes me that 'experience has 

 demonstrated the fact that it is about as easy and 

 far more economical to work the pump by'hand 

 power than to use the pitman rod.' By dispensing 

 with it, the tank may be placed on any cart with- 

 out special construction. This machine has been 

 considerably used, but its price (%b^ without the 

 cart) is very high when compared with that of 

 others here described. 



Absence in the field during much of the 

 summer will oblige us to discontinue for 

 the present all book notices and acknowledg- 

 ments. The present number has been 

 partly edited on the rail, and we ask 

 indulgence for possible shortcomings 



