388 Foreign Literature and Science. 
tion of the residue which is observed in the sulphuric acid of 
commerce, after its concentration : this residuum is sulphate 
of iron at the maximum, and not, as has been heretofore sup- 
posed, sulphate of lead. ‘The small quantity of the latter, 
remains in solution in the acid, whilst the former, at first dis- 
solved in the weak acid, is precipitated by its concentration. 
This is even a good method of depriving the minimum sul- 
phate of iron of its water, when destined for the preparation 
of anhydrous sulphuric acid.— Bull, Univ. Sept. 1826. 
11. New substance which inflames on water.—At Doulens, 
mear Amiens, is a large cotton factory, belonging to M. 
Morgues, which is lighted by oil gas. ‘This gas, after issuing 
from the cylinder in which it is formed, passes through a 
vessel of oil, in which it deposits a white liquid substance, 
by means of a cock in the lower part of the vessel. A 
workman passing, spilt some of this upon wet ground, it 
took fire spontaneously, and having flowed into a neighbor- 
ing brook, it spread over the surface, which appeared to be 
en Idem. ~ 
12. Lupulin —It has been thought that this substance ex- 
isted only on the saly cones of the female flower of the hop ; 
but M. Raspail has: discovered that the young leaves and 
buds of the plant yield it abundantly. To prove this, it is 
only necessary to allow these portions of the plant’to dry on 
aseive, when, upon agitation, as much lupuline will be ob- 
tained, observing the same proportions, as from the scaly 
cones of the female flower, M. Raspail is of the opinion that 
the odoriferous principle, which is communicated to beer, is 
more extensively spread through the substance of the leaves 
than in the yellow grains, and that the latter owe their odour 
to the remains of the parenchyma of the scales which sup- 
It exists especially, and with 
the ds of the hop, on the Canabis 
AD odour analogous to that of the hop. 
