 | Medicine - 1847 - 736 pages
...making a complete revolution of the field in which tbe markings just mentioned were distinctly visible. In order to bring out these appearances, it is necessary that the light should be very oblique, and must be passed laterally through the " bull's eye," in such a manner that the object (the navícula,)... | |
 | English periodicals - 1847 - 420 pages
...making a complete revolution of the field in which the markings just mentioned were distinctly visible. In order to bring out these appearances, it is necessary that the light should be very oblique, and must be passed laterally through the " bull'seye " in such a manner, that the object (the Navicula)... | |
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... transverse lines, giving the whole the appearance of being covered with a delicate net-work. Four drawings of this object were exhibited, showing it in as many different positions, making a complete revolution of the field in which the markings just... 