A Cockney Naturalist will have no difficulty in procuring specimens to stock a marine vivarium in London.

William Thompson, Esq., of Weymouth, has for some time constantly employed a dredge, for the purpose of supplying the Zoological Society with specimens for their tanks, and also undertakes to supply any one who wishes to make the experiment. It would be necessary to have a zinc travelling tank made, but Mr Thompson can give your correspondent every information about this.

The carriage by mail train, including immediate delivery by special messenger, does not cost more than three or four shillings, and I think that a moderate sized tank (for instance, 2 feet long, 16 inches wide and 16 inches deep) could be stocked at an expense of fifteen to twenty shillings. Coral rag is the best material for rock-work and I should advise your correspondent to have a basket of sea sand and fine gravel sent up. J.G.H., Clapham

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