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There are also three refracting media, the aqueous humour, the lens and the vitreous humour or body.

The first occupies the space immediately behind the cornea, and is called the aqueous humour, f f, from its liquidity and its resemblance to water.

The iris forms a diaphragm suspended in the space behind the cornea which is filled with clear fluid, the aqueous humour.

The aqueous humour, so called from its resemblance to water, fills up all the space between the cornea and the crystalline humour.

B. The rodlets after three hours' culture in a drop of aqueous humour.