. no protection beyond a well secured glass cover. Many It is the work of an instant to cover an object in this said to be of a very palatable and wholesome nature. of these objects are interesting and in some degree valu- In a narrative of Lord McCartney's embassy to China, way, and the slide… … sary to place a double convex lens of, say, 5 inch focus Fig. 3.-CBYSTALS OF SALICINE UNDER POLARIZED Fig. l.-QUICK METHOD OF MOUNTING MICROSCOPIC about half way down the draw tube. The action of LIGHT-HALF OF THE FIELD BACKED BY MICA. OBJECTS. such a lens is the reverse of that of an amplifier.…
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