Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 292
s previously discovered, and two setsof diagonal lines on the scales of the cabbage butterfly in ad-dition to the longitudinal ones with the cross stripe, hithertoobserved.* On Test Objects. (202.) Dr. Goring has tiie merit of having introduced theuse of test objects, or objects whose texture or… … bat, and D and E the hair of the mouse. The most difficultof all tbe test objects are those in the scales of the podura andthe cabbage butterfly mentioned above. Rides for microscopic Observations. (203.) 1. The eye should be protected from all extraneouslight, and should not receive any of the…
Optics
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
