Laumonite is known by its generally chalky appearance and a probable
failure in finding it.
Heulandite is distinguished from stilbite by its crystals and perfect
solubility; from apopholite by form of crystals.
In the next part of this paper I will commence with Staten Island.
July 1, 1882. (_To be continued_.)
* * * * *
ANTISEPTICS.
The author has endeavored to ascertain what agents are able to destroy
the spores of bacilli, how they behave toward the microphytes most
easily destroyed, such as the moulds, ferments, and micrococci, and if
they suffice at least to arrest the development of these organisms in
liquids favorable to their multiplication. His results with phenol,
thymol, and salicylic acid have been unfavorable. Sulphurous acid
and zinc chloride also failed to destroy all the germs of infection.
Chlorine, bromine, and mercuric chloride gave the best results;
solutions of mercuric chloride, nitrate, or sulphate diluted to 1 part
in 1,000 destroy spores in ten minutes.--_R. Koch_.
* * * * *
CRYSTALLIZATION AND ITS EFFECTS UPON IRON.
By N.B. WOOD, Member of the Civil Engineers' Club, of Cleveland.
[Footnote: Read January 10th. 1882.]
The question has been asked, "What is the chemically scientific
definition of crystallization?" Now as the study of crystallization and
its effect upon matter, physically as well as chemically, will be of
interest, considering the subject matter for discussion, I shall not
only endeavor to answer the question, as I understand it, but try to
treat it somewhat technologically.
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