274 REPORT 4, UNITED STATES ENTOMOLOGICAL COMMISSION. 



A. J. Laue, of Glenville, Ohio, as pateuted in No. 226588, April 20, 

 1880. It consists of a knapsack of cylindrical form Laving a piston of 

 its inside diameter held down b^^ a strong spiral spring. The piston- 

 rod is exserted above, whereby it is raised and the spring is compressed 

 until the can is filled. Then the spring is allowed to press the piston 

 upon the liquid which finds exit by a side tube near its base. A hose 

 extension bears a stiff tube having a thumb- levered valve and rose. 

 The can is carried on the back by loops over the shoulders. Of its 

 practicability 1 am unable to speak, except that it has not a promising 

 ■iispect. 



A simple rose-syringe, having its middle two-fourths surrounded by 

 :a large concentric cylindrical can for the liquid that can enter the 

 •syringe by perforations which the piston-head may close when pushed 

 down, was granted as an insect- destroyer in patent ^o. 216679, June 

 17, 1879, to Mr. G. H. Hull, of Montello, Marquette County, Wisconsin. 

 The instrument thus has no valves but the piston-head, and should 

 prove superior to the ordinary watering-pots and syringes. Prior to 

 this, however, there was issued to Mr. G. T. Wisner, of Florida, Orange 

 ■County, Kew York, in l^o. 193742, July 31, 1877, letters patent on a 

 ^'Potato bug Poison-syringe" having the same general plan as that 

 ^ust noticed, but differing chiefly in possessing two piston -packings and 

 ;a funnel-shaped receptacle surrounding it. 



Barrel and Tank pumps and Appurtenances. (Plates xlii, 

 MT SEQ.) — Besides the devices already noticed as employable with bar- 

 rels or tanks forming parts of machines or carried upon vehicles, or hauled 

 iupon legs having wheels or runners, or upon horseback, certain barrel- 

 pumps and tank-pumps proper and appurtenant machinery deserve 

 •special consideration as follows. Many of these are presented here only 

 ;as parts of the history of this subject, while some have a very decided 

 value. 



[Single acting, discliarging from beloio the Piston.] 



J. C. Melcher^s Patent Spray Pump.-^ Among the earlier pumps used 

 <€speciall3^ for the cotton crop should be mentioned that of Mr. J. 

 '0. Melcher, of Black Jack Springs, Fayette County, Texas, which em- 

 Jbodies his patent of January 18, 1876. At present our knowledge 

 of it is based only on a very rough wood-cut and circular. The pump 

 can be made either of sheet metal or stronger metal and may be 

 worked with or without a lever. The lever was fixed to the head 

 of a barrel by a vertical rod, as with Mr. Euhmann's (see further on). 

 The cylinder of the pump was inserted through a large hole in the 

 head of the barrel and had a cloth suction-strainer below, while its 

 top appeared fastened by a collar around the piston and having two 

 opposite strii^s extending laterally downward to the head of the barrel, 

 allowing the pump to be rotated on its axis, to direct the spray. The 

 discharge-spout is long, bearing a biconic air-chamber above and a large, 

 single, terminal nozzle tor broadcast sprinkling, appearing to be the 



