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THE IMPROVED DEMONSTRATING OPHTHALMOSCOPE
1872
The Lancet
ANYONE who has succeeded in maintaining even a small salt-water aquarium in working order will know the difficulties and the pleasures that attend it. There is, first of all, the due adjustment of the balance between animal and vegetable life by the proper arrangement of both forms in the tank, to say nothing of the various disturbing causes which may give rise to the death of an animal or plant and the poisoning of the aqueous medium, on the purity of which the life of both depends. We are
doi:10.1016/s0140-6736(02)63956-x
fatcat:soh6trmqvzdivchiupm43w63ii