i70 Scientific Intelligence. 
longer in the oven. If the fat has been left in, a kind of cake may 
be made, of an agreeable taste, and which is more easily kept than 
that made of butter. When this bread has become dry, it may be 
pulverised under a rolling mill, and a kind of flour is obtained, very 
savory and nourishing, and suitable for making a good potage, or for 
mixing advantageously with other aliments of a less nutritive quality. 
This flour is easily transported, and contains much nourishment in a 
small bulk.— Bibliotheque Universelle, Juillet, 1828. 
6. The color of the sea, is ascribed by Sir Humphrey Davy, in 
part at least, to the presence of iodine and bromine, which its waters 
certainly contain, and which result perhaps from the decomposition 
of marine vegetables, These two substances, dissolved in a small 
quantity of water, give a yellow tint, and this tint mingled with the 
blue tint of pure water may produce the sea green.— Salmonia. 
__ 1. Solar phosphori—M. Osann has found that a superior phos- 
phorescent substance is obtained by calcining oyster shells, (selecting 
for this purpose the whitest and most porous,) and when cleaned 
placing them in a crucible, previously covering the bottom with finely 
pulverised sulphuret of antimony, and then alternating the shells and 
antimonial powder, sifting on the latter to the depth of two lines be- 
tween each layer of shells. The crucible is then closed and exposed 
luring an hour to a red heat. The superior and inferior strata of 
shells are commonly soiled, and may be rejected. The phosphorus 
thus obtained, after having been exposed to the sun, shines in the 
dark with a greenish white light, and is superior to the Bolognian 
phosphorus, both in intensity and duration. 
When sulphuret of arsenic (realgar) is substituted for sulphuret of 
antimony, the pieces shine with a blue light, analogous to the flame 
of sulphur. In this, as in the preceding, only the places that are per- 
fectly white are phosphorescent. At presents here and there points 
which shine with a purple red. If exposed long to a red_heat, its 
light is decolored and becomes completely white. 
lese compounds may be preserved in closed vessels. They will 
Femain good for three weeks, if exposed to the air, and it is only 
when the lime falls into powder that their light is extinct. —Bib- 
Univ. Fer. 1829. 
«8. ‘Test of the strength of chlorine or chloride of lime.-—The so- 
bution of indigo, which has long been oie estimating the 
