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A diagram was drawn to show the manner of ascertaining the two Gauss points of a bi-convex lens, and a sheet exhibited in which the various kinds of lenses with their optical centers and Gauss points were shown. Hugo Schroeder, now with the firm of Ross & Co. The lecturer congratulated the newly-proposed member of the Society, Mr.
John Stuart, for his enterprise in securing for this country a man of such profound acquirements. The subject of distortion was next treated of, and the manner in which the idea of a non distorting doublet could be evolved from a single bi-convex lens by division into two plano-convex lenses with a central diaphragm was shown.
The greater part of it is taken up with a semi-fluid, transparent gelatinous substance, the corpus vitreum. It is a lenticular, bi-convex, transparent body, the most important of the refractive media in the eye.
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