made, he expects ultimate success. He finds that, for very sharp-edged
instruments, this method is much better than the ordinary one; that the
colder the air and the more rapid its stream, the greater is the effect.
The effect varies with the thickness of the mass to be hardened. The
method succeeds well with case-hardened goods.-- _From the French_.


_Detection of Blood_.


A controversy has recently taken place in Paris, relative to the
efficacy of certain chemical means of ascertaining whether dried spots
or stains of matter suspected to be blood, are or were blood, or not. M.
Orfila gives various chemical characters of blood under such
circumstances, which he thinks sufficient to enable an accurate
discrimination. This opinion is opposed by M. Raspail, who states, that
all the indications supposed to belong to true blood, may be obtained
from, linen rags, dipped, not into blood, but into a mixture of white of
egg and infusion of madder, and that, therefore, the indications are
injurious rather than useful.


_Cedars of Lebanon_.


Mr. Wolff, the missionary, counted on Mount Lebanus, thirteen large and
ancient cedars, besides the numerous small ones, in the whole 387
trees. The largest of these trees was about 15 feet high, not one-third
of the height of hundreds of English cedars; for instance, those at
Whitton, Pain's Hill, Caenwood, and Juniper Hall, near Dorking.