h of
the same temperature, and _vice versa_.

Mr. Piddington has analysed several Indian soils, distinguished for
the production of superior tobacco. These are the table soils from
Arracan, (Sandoway,) a soil from Singour, in Burdwan, near
Chandernagore, the tobacco of which, though of the same species as
that of the surrounding country, sells at the price of the Arracan
sort; and the soil of the best Bengal tobacco, which is grown at, and
about Hingalee, in the Kishnagur district.

The best tobacco soils of Cuba and Manila, are for the most part red
soils. Now, the red and reddish soils contain most of their iron in
the state of peroxide, or the reddish brown oxide of iron; while the
lighter grey soils contain it only in the state of protoxide, or the
black oxide of iron. Mr. Piddington believes the quality of the
tobacco to depend mainly on the state and quantity of the iron of the
soil, while it is indifferent about the lime, which is so essential to
cotton. None of the tobacco soils contain any lime. Their analysis
show them to contain:--

Arracan soil. Singour soil. Hingalee soil.
Oxide or iron, (peroxide) 15,65 10,60 6,00
Water and saline matter 1,10 75 1,50
Vegetable matter and fibre 3,75 1,10 75
Silex 76,90 80,65 87,25
Alumina 2,00 4,50 1,50
------- ------- -------
99,40 97,60 97,00
Water and loss 60 2,40 3,00
------- ------- -------
100 100 100

From which it will be seen that the best tobacco soil hitherto found
in India contains about sixteen per cent., or nearly one-sixth, of
iron, which is mostly in a state of peroxide; and that the inferior
sort of tobacco grows in a soil containing only six per cent., or
one-sixteenth of iron, which is, moreover, mostly in the state of
protoxide, or black oxide. Mr. Piddington thought it worth examining
what the quantity of iron in the different sorts of tobacco would be,
and found that while the ashes of one ounce, or 480 grains of Havana
and Sandoway cheroots gave exactly 1.94 grains, or 0.40 per cent., of
per