Nay, you may see, not unfrequently, on Margate sands, your own six-years-old engineers of children keep out the Atlantic ocean quite successfully, for a little while, from a favourite hole; the difficulty being not at all in keeping the Atlantic well out at the side, but from surreptitiously finding its way in at the bottom. And that is the real difficulty for old engineers; properly the only one; you must not let the Atlantic begin to run surreptitiously either in or out, else it soon becomes difficult to stop; and all reservoirs ought to be wide, not deep, when they are artificial, and should not be immediately above villages (though they might always be made perfectly safe merely by dividing them by walls, so that the contents could not run out all at once). But when reservoirs are not artificial, when the natural rocks, with adamantine wall, and embankment built up from the earth's centre, are ready to catch the rain for you, and render it back as pure as their own crystal,--if you will only here and there throw an iron valve across a cleft,--believe me--if you choose to have a dividend out of Heaven, and sell the Rain, you may get it a good deal more easily and at a figure or two higher per cent. than you can on diaphanous mustard. There are certainly few men of my age who have watched the ways of Alpine torrents so closely as I have (and you need not think my knowing something of art prevents me from understanding them, for the first good canal-engineer in Italy was Lionardo da Vinci, and more drawings of water-wheels and water-eddies exist of his, by far, than studies of hair and eyes); and the one strong impression I have respecting them is their utter docility and passiveness, if you will educate them young. But our wise engineers invariably try to manage faggots instead of sticks; and, leaving the rivulets of the Viso without training, debate what bridle is to be put in the mouth of the Po! Which, by the way, is a running reservoir, considerably above the level of the plain of Lombardy; and if the bank of that one should break, any summer's day, there will be news of it, and more cities than Venice with water in their streets. June 24th. You must be content with a short letter (I wish I could flatter myself you would like a longer one) this month; but you will probably see some news of the weather here, yesterday afternoon, which will give some emphasis to what I have been saying, not for the first time by any means; and so I leave you to think of it, and remain Faithfully yours, J. RUSKIN. NOTES AND CORRESPONDENCE.