Note 5 — Chapter I

For further information, I must refer my readers to Parkinson’s “Treatise on Optics;” Herschel’s “Familiar Lectures on Light;” “Cyclopædia Britannica;” Everett’s translation of Deschanel’s “Physics;” and Nägeli and Schwendener’s “Theory and Practice of the Microscope,” translated by Frank Crisp, LL.D.