a ane a ee 
for preferving Corn on Ship-board. 40% 
fame time) forwards, its power becomes fo weakened, that 
{mall egrefs only will be made, till the pipes are filled with 
a fluid more denfe than -atmofpherie air, whieh will then, as 
is juftly noticed, fue where it finds the leaft obftruction, 
unlefs attracted to the {pot moft heated. 
Many circumftances may caufe one part of the cargo to be 
lefs permeable than the reft; fhould it prove fo, the means 
readily offer for airing and purifying even this. 
Suppofe the hatches to be caulked down, and the hold 
made impervious to waters in fuch eafe, the lapfe of aif, 
under the obftructions met with in its paflage, could by no 
means keep pace with the influx from the forcing-pump; 
confequently, if the holes in the deck, defigned for its exit, 
be kept clofe-ftopped till the pumper feels refiftance, all the 
intervals of the cargo, be they ever fo minute or irregular, 
muft be occupied by freth air, which, when permitted to 
efcape, will carry off impurities with it. And. thus, by 
ftopping and opening fuch vents repeatedly, no part of the 
cargo could mifs of purification. and this perhaps may be 
the beft mode of adminiftering it. 
Prevention is better than a cure. 
In a veffel equipped with the apparatus defcribed, the in- 
attention muft be great, if the corn be fuffered to fuftain any. 
injury at all. By an early ufe of it, per{piration and damps 
will prefently be dried away; heating of courle will be pre- 
yented ; and even the production of the pernicious grub al- 
Juded to: for, be the nidus of its eggs ever fo productive, 
their embryos will, not vivify, without moifture to fuftain 
them. Wherefore, it fhould feem that the corn-merchant 
in future will have little to fear, fave the influx of fea-water 5 
and even this (if in {mall quantities) wall, by the frequent ufe 
of the ventilator, eradually dry away. ' 
wl byouey. 3F INTEL- 
