26 THE NORTH ATLANTIC TELEGRAPH. the time was Iceland, and it was 250 miles distant. I simply mention this interesting fact, which I witnessed, leaving it to be enlarged upon by Dr. Wallich, the able naturalist of the Expedition, who is still employed by the Admiralty in the microscopic examination of our specimens of the sea-bottom. The result of his investigations (which will be published hereafter) may he of great importance to Marine Telegraphy, proving, as it will do, the existence of animal life at very great depths. We are aware that the coating of a Mediterranean cable was attacked by minute creatures allied to the ordinary Teredo,* at the depth of sixty or seventy fathoms, and should it he found that similar boring animals exist in great depths, it will become imperative to protect the insulation of the wire against their ravages; but time does not admit of a digression from the object of this paper, which is simply to lay before you my expe- rience and opinion with regard to the physical aspect of the proposed route ; it may not, however, be out of place to mention, that the great pressure exerted at depths approaching to 2000 fathoms is sufficient to squeeze the tar freely out of rope: could we recover a cable from these depths, we would find the tar similarly expressed from its canvas wrappings. If the tar used were of a sufficiently viscid description to harden and remain coated upon the wrappings, it would probably afford quite a sufficient protection against these destructive creatures. Once laid in deep water, the North Atlantic Cable will pro- bably he more secure and more durable than any other; as it will lie at the bottom of a sea where the temperature is unusually low, and where animal life is proportionately rare. * See a Paper by J. Gwyn Jefferys, F.R.S., on “The British Species of Teredo,” published in “The Annals and Magazine of Natural History,” for August, 1860.

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