Little Masterpieces of Science_ Health and Healing

Rules to be observed by masters and pilots of vessels, arriving at the port of Philadelphia, established by the health law, and regulations of the Board of Health, to which is annexed, a supplement to the health law, passed on the 2d day of April, 1821.

Health, Healing, and Faith

Little Masterpieces of Science_ The Naturalist as Interpreter and Seer

Little Masterpieces of Science_ Explorers

Little Masterpieces of Science_ Invention and Discovery