[116] "Heat as a Mode of Motion," "Forms of Water," etc. (Eng., 19th cent.)
[117] "On Sound." (Eng., 19th cent.)
[118] "Scientific Researches." (Eng., 19th cent.)
[119] "Conservation of Energy." In a book on this subject edited by E. L. Youmans. (Ger., 19th cent.)
[120] "Man's Place in Nature." (Eng., 19th cent.)
[121] Botany. (U. S., 19th cent.)
[122] "Methods of Study in Natural History." (U. S. 19th cent.)
[123] Physics. (U. S., 19th cent.)