Now it is assuredly a matter of surprise that an invention so singular and novel in character, promising unheard of advantages, should not have attracted the general attention of all patrons and promoters of science. The only instance of a passing remark from a scientific source is anything but gratifying. Dr. Hook, writing to the Honourable Robert Boyle about the early part of 1667,[14] reports certain experiments with glass tubes then being carried on at Gresham College, after which he says:--“Sir R. Moray presented the Society with an engine sent them by Prince Rupert; being for raising water, such a one as, I am sure, you have seen and taken notice of in Scottus his mechanics, whose contrivance is, continually to raise water, by turning round a cylinder with a sliding board in it, included in another hollow cylinder, or barrel. The Engine has not been tried, but it will be the next Wednesday. But I find that it goes exceedingly hard with the several grating and sliding motions that it has, so that it is more likely to prove a pretty curiosity than a useful engine. But this gave an occasion for producing the definition or description of the Marquis of Worcester’s Water-commanding Engine, which is so purely romantic that it would serve one rarely to fill half a dozen pages in the _History of Fortunatus his Wishing Cup_. A transcript of some of the most observable passages, because I could not procure the book itself to send you, I have here enclosed, which if it should chance to perform but the least part of what is therein specified, my Lord Brereton is likely to pay £5 towards the revenue, that is to accrue thereby to the Marquis, he having wagered so much against him. I was since my return to London to see this engine, where I found Caltrop his chief engineer, to laugh at it; and as far as I was able to see it, it seemed one of the perpetual motion fallacies. Of which kind Caltrop himself, and two or three others, that I know, are labouring at this time in vain, to make, but after several ways; and nothing but costly experience will make them desist.”