freezing, in the manner recommended for treating the acetous acid.
SECT. XLII.--_Observations upon Bombic Acid, and its Combinations with
Acidifiable Bases[52]._
The juices of the silk worm seem to assume an acid quality when that
insect changes from a larva to a chrysalis. At the moment of its escape
from the latter to the butterfly form, it emits a reddish liquor which
reddens blue paper, and which was first attentively observed by Mr
Chaussier of the Dijon academy, who obtains the acid by infusing silk
worm chrysalids in alkohol, which dissolves their acid without being
charged with any of the gummy parts of the insect; and, by evaporating
the alkohol, the acid remains tollerably pure. The properties and
affinities of this acid are not hitherto ascertained with any precision;
and we have reason to believe that analogous acids may be procured from
other insects. The radical of this acid is probably, like that of the
other acids from the animal kingdom, composed of charcoal, hydrogen, and
azote, with the addition, perhaps, of phosphorus.
TABLE _of the Combinations of Sebacic Acid, with the Salifiable Bases,
in the Order of Affinity._
_Bases._ _Neutral Salts._
Barytes Sebat of barytes.
Potash potash.
Soda soda.
Lime lime.
Magnesia magnesia.
Ammoniac ammoniac.
Argill argill.
Oxyd of
zinc zinc.
manganese manganese.
iron iron.
lead lead.
tin tin.
cobalt cobalt.
199