Treatise on Light was published in 1690 and is probably the largest scientific volume on light published before Newton's Opticks. The book explains how light travels (i.e., that it has a certain velocity), and what happens when it hits a surface (refraction and reflection). A large portion of the book is devoted to the double refraction occurring in Iceland chrystal, and all drawn conclusions are proved geometrically. Christiaan Huygens (1629 - 1695) was a prominent physicist and astronomer. His main discoveries are the centrifugal force, collision laws for bodies and the argument that light consists of waves...

In this work Levison aims to create a book that allows beginners to be able to understand how to identify trees, as well as to give information of their structure and uses. Once these topics are addressed, he then moves into concepts of care, planting and forestry.

Chet Ballard answers the pinpoint of light that from the craggy desolation of the moon stabs out man's old call for help.

A history of woman's role in science through the ages and the many contributions she has made.Chapter Titles are:1. Woman's Long Struggle for Things of the Mind2. Woman's Capacity for Scientific Pursuits3. Women in Mathematics4. Women in Astronomy5. Women in Physics6. Women in Chemistry7. Women in the Natural Sciences8. Women in Medicine and Surgery9. Women in Archæology10. Women as Inventors11. Women as Inspirers and Collaborators in Science12. The Future of Women in Science: Summary and Epilogue