University of Maryland
Optics Highlights: The Microscope
Part of an anecdotal history of optics and the study of light. Extremely thorough treatment of the scientific findings and developments which led to the invention and refinement of the microscope. Includes a short biographical sketch and...
New Advent
Catholic Encyclopedia: Jansenius and Jansenism
A lengthy English encyclopedia article on Cornelius Jansen and his teachings. Please note that "The Catholic Encyclopedia" is a historic reference source and should be viewed in the context of resource material dated 1910.