Transcriber's note:
Minor typographical errors and inconsistencies have been corrected. Some words had inconsistent hyphenation throughout the book; these have been made consistent.
Ions are shown as Fe+++, instead of using superscripts. There is some inconsistency in the notation used in the original text for chemical formulæ such as Na2Cr2O7(2H2O). These have been regularized to use the modern mid-dot, for example, Na2Cr2O7 · 2H2O.
The index entry for Hemlock bark had no page number in the original text, so the correct page number, 34, has been supplied.
On page 152 NaCO23 has been corrected to Na2CO3. On page 212, the variable n has been replaced with the correctly subscripted forms n1 and n2.