ch permits of a lateral move- and jerky flight, and their pursuers made no very de- jects not requiring the use of very high magnifying ment of the frame. This lateral motion is controlled termined or long-sustained efforts to capture them, powers. The instrument shown in our first engraving by… … upset each other and fell helplessly into the river be- copied from the originals have been in use for several low, where they succeeded in reaching the bank only MICROSCOPE FOR EXHIBITING ORDINARY MOUNTED years and no difficulties have been found in the way of to fall a prey to the expectant crow.…
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