In ancient Egypt officers estimated the case of sufferers from the inundations of the Nile. The changes of property in Bengal, by alluvion, are equally attended to. Inundation is also a method of impeding the approach of an enemy, by damming up the course of a brook or river, so as to intercept the water, and set the neighbourhood afloat. In Egypt the plan was diametrically opposite; for by flooding Lake Mareotis, our gunboats were enabled greatly to annoy the French garrison at Alexandria.