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"The crystalline form of copper sulphate." — Hallock, 1905

Copper Sulphate

"The crystalline form of copper sulphate." — Hallock, 1905

"Pure crystalline carbon, the hardest substance known, possessing great lustre owing to its great refracting power." — Williams, 1889

Diamond

"Pure crystalline carbon, the hardest substance known, possessing great lustre owing to its great refracting…

"Next in order is the aqueous humor, b, e, in the middle of which is the iris, d, c. Behind the pupil we have the crystalline lens, f, and then the vitreous humor, h, filling all the interior of the ball of the eye. m indicates the retina, which is an expansion of the optic nerve, n. k is the choroid coat, a membrane interposed between the retina and the sclerotic coat; it terminates in form in a series of folds or filaments, g, called the ciliary ligament or process." —Wells, 1857

Eye

"Next in order is the aqueous humor, b, e, in the middle of which is the iris, d, c. Behind the pupil…

In passing through the crystalline, the rays cross each other, so that those rays which pass from the lower part of an object are presented uppermost in the bottom of the eye and the reverse, so that the images of object are always inverted, or bottom side upwards. Labels: a, the aqueous; c, the crystalline; v, the vitreous humor.

Formation of an Image on the Eyeball

In passing through the crystalline, the rays cross each other, so that those rays which pass from the…