In the course of their peregrinations, Mr. Hope's guests of course paid a visit to the tank in which the sewage is received before it is pumped on the land. We need hardly say that the appearance of this miniature lake of nastiness was anything but agreeable; but its odor was by no means overpowering, nor, indeed, very offensive. The rill of bright, clear water which flowed in at one corner, and some of which was handed about in tumblers, looking as pure as the limpid stream which flows from the most effective filters that are to be seen in the windows of London dealers, had only a short time before flowed out of this hideous reservoir in a very different state. We had met it in the "carriers" flowing along in a dark, inky stream, not smelling much, but covered with an ugly gray froth which reminded one of some of the most disagreeable details in the manufacture of sugar and rum, or suggested the idea that it had been used for a very foul wash indeed. With these reminiscences fresh in one's memory, it required some courage to comply with the pressing invitations to taste this 'effluent water.' There were, however, many of the party who braved the attempt; and, by all who tasted it, the water was pronounced to be destitute of any except a slightly mineral flavor. In dry weather, this effluent water, which has passed through the land and been collected by the drains, after mixing with the sewage, is again pumped over the fields; in wet weather, it can be turned into the brook which is dignified with the name of the river Rom. * * * We have omitted to mention that the rent paid by Mr. Hope is L3 per acre, and the cost of the sewage (at 2s. per head) L6 more." --I think few thoughtful readers will doubt that here is the germ of a great movement in advance for the Agriculture of all old and densely peopled communities, and that our youngest cities and manufacturing villages may wisely consider it deeply, with a view to its ultimate if not early imitation. That we are not prepared to incur the inevitable expense of a thorough system of sewerage with reference to the application to the soil of all the fertilizing elements that a city would gladly spare, by no means proves that we should not consider and plan with a view to the ultimate creation and utilization of Sewage. XLVI. MORE OF IRRIGATION. I have thus far considered Irrigation with special reference to those limited, yet very considerable districts, which are traversed or bordered by living streams, and, having a level or slightly rolling surface, present obvious facilities for and incitements to the operation. Such are the valleys of the Platte, and of nearly or quite all its affluents after they leave the Rocky Mountains; such is the valley of the upper Arkansas; such the valleys of the Smoky Hill and the Republican, so far down as Irrigation may be considered necessary. Irrigation on all these seems to me inevitable, and certain to be speedily, though capriciously, effected.