108 
CORN MILL.-PERUVIAN AND AFRICAN GUANO. 
ration when the season permitted. In 1786, it is said, 
150 hogs, weighing 10,590 lbs., were slaughtered for 
provisioning the family. These were exclusive of 
beef, mutton, fowls, and fish. The estate was conve¬ 
niently divided into separate farms, which General 
Washington visited every pleasant day. He was con¬ 
stantly engaged in making experiments for the im¬ 
provement of agriculture, and was considered fore¬ 
most among the enlightened farmers of his day. 
What a different aspect the farm now presents ! 
The above is a cut of Sinclair’s patent Corn Mill. 
It is well adapted for plantation use at the South, or 
for the isolated farmers of the West, and the posses¬ 
sion of one ot these machines enables every one to 
become his own miller. They grind coarse or fine 
meal with equal facility, perfection and despatch, at 
the rate of two and a half to three bushels per hour. 
When the screen is attached (as shown in the centre 
of the cut), and the fine meal is required to be ground, 
it will be necessary to drive the mill by horse-power. 
Coarse meal for horses may be ground by two men 
with good success. The grinding plates, which are 
made of the hardest composition metal, will last about 
two years without renewing; after they are worn 
smooth new ones may be put on without difficulty. 
A feeder is attached to the axle which is intended to 
pass the grain into the plates at regular intervals. 
This feeder is important, and obviates the difficulty 
and objection to cast iron mills generally 
Directions for Managing the Corn Mill. —1st. See 
that the hopper, bolting-box, screen, pulleys and band, 
are properly put on and adjusted. 2d. Place the mill 
pulley on a line with the power band-wheel, and se¬ 
cure the mill to the floor or ground by cleets and 
braces. 3d. When all is thus fixed and ready, start 
the machine, then fill the hopper, and while the mill 
is running screw up the two thumb-screws, until the 
plates come sufficiently in contact to grind fine meal. 
When the plates are properly set or screwed up, the 
product will be about three quarters sifted meal and 
one quarter tailings. 4th. The corn should be oid 
or well dried, otherwise the grinding will be very im¬ 
perfect. 5th. Keep the journals well oiled with the 
best sperm or sweet oil. 6th. If driven by hand- 
power the screen and short band should be taken off, 
and the sifting done separate by hand, in the common 
way; these mills, however, should be driven by 
horse-power, if possible, at the rate of two hundred 
revolutions per minute, which is the proper speed to 
cause them to perform properly, and which speed 
cannot be got up by hand-power. 7th. If the 
main driving-band stretches or becomes slack, move 
the machine farther off. 8th. Should the feeder fail 
to act, stir and loosen up the corn at bottom of the 
hopper. The plates may also clog, especially if damp 
corn is put into the hopper. They may be cleaned by 
taking off the cap that covers them, and briskly rub¬ 
bing between the plates a flat coarse brush or stick. 
Before removing the cap, it will be necessary to run 
the band-pulleys back, which may be done by stack¬ 
ing the screw that confines it. When necessary to 
put on new plates, remove the front iron frame, pul¬ 
ley, plate cap, and the caps over the boxes, which 
will allow the axle to be drawn out and to expose 
the plates, which remove and put on others, minding 
to have them fitted on exactly true. Price, with one 
set extra plates, $40. 
PERUVIAN AND XfRICAN GUANO. 
American Agricultural Association. —By or¬ 
der of this Association, at its last monthly meeting, 
the following resolution was passed : 
“ Resolved, That the Association cause an analy¬ 
sis to be made of the cargoes of guano from Ichaboe 
and Peru, now in the market for the use of members 
and all persons in the neighborhood ; and that a re¬ 
port be drawn up with the analysis containing sug¬ 
gestions for the application of the manure; the whole 
to be published as early as practicable in the agricul¬ 
tural papers of this city and vicinity.” 
Peruvian Guano. —The specimen was obtained 
from Mr. Allen, 205 Broadway, who is an agent for 
the sale of it. 
Uric acid.10 5 
Ammonia - 190 
Phosphoric acid - - - - 14 0 
Lime and magnesia ... 160 
Salts of soda and potash - - 6 0 
Oxalic acid, with carbonic and muriatic 
acids.130 
Water ------ 13*0 
Sand.20 
Volatile and organic matters - - 6 5 
Ichaboe Guano.— The specimen 
100-00 
was obtained 
from Mr. Irvin, Front street, 
Ammonia 
Humic acid 
Phosphates 
Oxalic, See., acids 
Salts of soda, &c. 
Water and volatile matter 
Sand • 
and is a fair sample. 
13-5 
40 
250 
20*0 
70 
27-5 
30 
10000 
Prices and Relative Value of the Peruvian and 
African Guano.— These specimens are both very fair, 
and represent the peculiarities of the two kinds of 
guano. The absence of uric acid in the African 
variety, is the cause of its inferiority; for that body 
decaying gradually in the soil, continues to yield car¬ 
bonate of ammonia for a long time, so that the stimu¬ 
lating effects of the guano are seen the next year, 
