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Now, net tonnage means that part of a vessel's carrying capacity which remains for the accommodation of passengers and freight after all its own requirements have been met, a large allowance having always to be made for such spaces as engine room, crew room, coal bunkers, etc. Lord Wolseley's rule for raising net to gross for merchant steamers is to add 53 per cent, to the former,^[1] but Major Clarke considers that an addition of about 66 per cent, is necessary,^[2] and Colonel G. A. Furse, perhaps a still greater authority, is in favour of 70 per cent.^[3]; but, faithful to my custom of under, rather than over, estimating Germany's difficulties, I will content myself with adding 50 per cent, in arriving at the amount of gross tonnage that she will require to accommodate her Invading Force.

1. The Soldiers' Pocket-book, p. 181.
2. Staff Duties, p. 266,
3. Military Expeditions Beyond the Seas, p. 208,