To make a River in a Garden to ebbe and flow constantly, though twenty foot over, with a childs force, in some private room or place out of sight, and a competent distance from it. [_An ebbing and flowing River._] In reference to this invention Mr. Partington has quoted Peter Bogaerts’ ingenious method of a canal lock, so contrived that, in a model, a weight of seven pounds was made to raise ten hundred weight of water more than four feet in a few seconds. But still the process of ebbing and flowing is not made out; it does appear, however, that its operation requires the constant services of a boy or other attendant, probably to keep alternately opening and closing certain sluice arrangements, placed somewhere concealed from view; the whole affording a water-work to amuse and surprise, and forming a variety on the usual strange schemes attached to grottos, caves, &c. spouting water in every variety of form. See further the comments on article No. 57, which very probably includes the principle here employed by the Marquis. There is no communication in this article of facts requisite to direct an engineer or inventor in the adjustment of any special kind of machinery to obtain the desired ebbing and flowing river; which is a novelty, in this respect, peculiar to the Marquis of Worcester’s ingenuity. He was evidently not copying or improving any anterior system of water-work. The next article is but an application of this new system; and it is not until he has taken us through descriptive hints of thirty-three totally different designs or devices, that in No. 57, he offers “A constant water-flowing and ebbing motion.” We think the three may be taken together, that is, No. 57, refers to the principle and mechanism, of which Nos. 22 and 23, are mere simple applications. Thus, referring to what we have stated under No. 57, the purpose named in the present article might be attained by means of two domed or bell-shaped vessels, placed like gasometers, but otherwise immoveable, partially immersed in a pond, or other artificial piece of water; which being arranged so that, by admitting a steam pipe into each, the contained air could be driven out thereby, condensation would naturally follow, or might be accelerated; and one vessel immediately filling with water, while the other was emptying, the surface of the pond or river would be kept in a continual state of agitation, and the water might be said to “ebb and flow constantly, though 20 feet over.” No reason is assigned for proposing this modification of water work, no advantage is pointed out, the Marquis doubtless depending on its apparent impossibility for its exciting and stimulating inquiry. He knew how the promulgation of such a wonder would have affected his own mind, and never imagined but that the public would feel equally inquisitive. His incomprehensible truths are, however, often denounced, without investigation, as though they were false. 23.