22/32 $1.40 This is the standard text-book for high school and elementary college work. The book has been thoroughly revised, enlarged, and improved, while the general and distinctive features of the former work have been preserved. As now published, it combines the results of the life experience and observation of its distinguished author with the latest discoveries and researches in the science. 1575 illustrations $5.00 This great work was thoroughly revised and entirely rewritten under the direct supervision of its author, just before his death. |