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Ophthalmia in the dog presents us with symptoms altogether different. The conjunctiva is red; that portion of it which spreads over the sclerotica is highly injected, and the cornea is opaque.
If it can be shown that natural variation and natural selection were capable of forming the crystalline lens, it will not be denied that they were capable of forming the iris, the sclerotica, the aqueous humors, or any and all the other parts. Suppose, then, that we have a number of animals, with eyes yet wanting the crystalline.
The conjunctiva and particularly that portion which covers the sclerotica, will be considerably injected, but there will not be the usual intense redness of inflammation. The vessels will be large and turgid rather than numerous, and frequently of a darkish hue.
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