282 REPORT 4, UNITED STATES ENTOMOLOGICAL COMMISSION. 
available for wells and cisterns, they are, as now made, not so well adapted for use 
in barrels, &c., though smaller, lighter styles of certain ones could be manufactured on 
the same general plan that might answer for this purpose. 
1. The "Buckeye force-pumps " as now made by Messrs. Mast, Foos & Co., of 
Springfield, Ohio. 
2. The pump patented by Messrs. J. M. & B. Branson, of Flushing, Ohio, in No. 
249885, November 22, 1881, and that by Mr. B. Branson, in No. 237240, February 1, 
1881. 
3 That issued to Mr. R. Bean, of Springfield, Ohio, in patent No. 9873, September 
13, 1881, aud "Bean's self-regulating force-pump" as now made at No. 6 Loyd street, 
Atlanta, Ga., Bird & Hannson, proprietors, No. 50 Marietta Street, Atlanta. 
4. One granted in No. 238498, March 8, 1881, to Mr. D. Gilbert, of Chambersburg, 
Pa. 
5. That in the patent No. 177401, May 16, 1876 # issued to Mr. D. Johnson, of Ash- 
land, Ohio. 
6. No. 241572, May 17, 1881, granted Mr. B. C. Vauduzen, of Cincinnati, Ohio. 
7. That of Mr. P. A. Myers, Ashland, Ohio, issued in No. 10048, February 28, 1882. 
8. Also, the "Red jacket force-pump" as now manufactured by Mr. J. P. Martin, 
of Cincinnati, Ohio. 
The Agitator Barrel-pump, planned and perfected by me in my work 
for the Department, lias already been in Professor Riley's annual report 
as entomologist, for 1S81 (pp. 159-162). The description is as follows • 
By reference to Plate XLVI, Fig. 2, the barrel, fc, will be seen in 
section, and some of its details, together with those of the pump and 
stirrer, may be noticed. The fulcrum,/, has a foot below screwed to 
the barrel. Through its top is a pivot, o, on which tilts the pump- 
lever, I, which is similarly hinged, at fc, to the top of the piston-rod, t. 
The pump cylinder, q, is also hung upon trunnions, i, projecting into 
eyes. In this illustration the eyes, e e, have each a neck fitting in a 
slot cut through the stave oppositely from the side of the bung hole, 
and beneath the stave is a foot on the eye-piece. Its neck is so short 
that the eye is held down firmly against the top of the stave, while the 
foot is as tight against its under surface. The length of the eye-piece 
is a little less than the diameter of the bung-hole, into which it may 
be inserted to be driven laterally into the slot. The slot is longer than 
the eye piece, so the latter may be driven away from the bung-hole for 
a distance greater than the length of the trunnion-pivot. Then the 
pump being inserted, until these pivots come opposite the eyes, the 
latter may be driven back as sockets over the pivots which play in 
them when the pump is worked. To hold these eyes toward the pump 
and upon the trunnions a wedge, t?, is driven in the slot beyond each 
eye-piece. Thus the pump is easily attached or removed and its union 
with the barrel is strong and firm. Perchance it be desired that this 
pump-hole be bunged the side slots may be wedged to make the barrel 
tight. 
The parts of the pump being hung as described, the hinge, />, forms ;i 
toggle joint, and in its action causes the pump to oscillate on its trun- 
nions, its basal end swinging wider than its top, as indicated by the 
dotted line from x toy. Upon the extremity of this swinging end is a 
