Introduction to elementary practical biology; a laboratory guide for high-school and college students Q Science
Half-hours with the telescope; being a popular guide to the use of the telescope as a means of amusement and instruction Q Science
Das leuchten der gase und dämpfe, mit besonderer berücksichtigung der gesetzmässigkeiten in spektren Q Science
Popular lectures on science and art; delivered in the principal cities and towns of the United States Q Science
