Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 731
air into the mass of water, and the gas given off by the vegeta-tion. The whole process of purification is therefore chemical, and the suc-cess and excellent adaptation of the system may be judged from the factthat the water seen in masses 9 ft. deep appears perfectly clear and bright.The building… … Fig, 321.— The Opelet {Anthea cereus). the air is maintained by hot-water pipes at from 60° to 65°, and the tem-perature of the water at about 55°. On winter evenings the aquarium isilluminated with gas, and the habits of many nocturnal animals can then beconveniently studied. All the animals in…
Inventions
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