Italic text is denoted by _underscores_ and bold text by =equal signs=.
The picture of a pointing finger, known in typography as an index, a
manicule, or a fist, has been rendered in this text version as "=>".
Subscripts have been rendered using braces, so that the formula for
sulphuric acid is shown as "H{2}SO{4}", and the formula for water, if it
had appeared, would have been shown as "H{2}O".
* * * * *
[Illustration: SCIENTIFIC AMERICAN]
A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHANICS,
CHEMISTRY, AND MANUFACTURES.
Vol. XXXIX.--No. 6 NEW YORK, AUGUST 10, 1878 $3.20 per Annum.
[NEW SERIES.] [POSTAGE PREPAID.]