After a lapse of five years, he writes another letter to Boyle,[14] on the same subject, furnishing us, incidentally, with the following curious and important details:--“The Earl of Worcester is buying Fauxhall from Mr. Trenchard, to bestow the use of that house upon Gaspar Calehof [Kaltoff] and son [son-in-law], as long as they shall live, for he intends to make it a College of Artisans. Yesterday (he adds) I was invited by the famous Thomas Bushel to Lambeth Marsh, to see part of that foundation.”[104] Hartlib was a generous-hearted man, who projected many schemes for public benefit. Evelyn styles him an “ingenious person, honest and learned;” that he deserved the latter distinction we may infer from the fact of Milton having addressed to him his treatise “Of Education.” These particulars serve to show a very early connection on the part of the Marquis of Worcester with Vauxhall, making it still more probable that he had established a laboratory or workshop there, years before the Civil War broke out; that from its extent it was proposed to retain it for the benefit of the State; and that on his own release from the Tower he sought to regain possession of the premises, but possibly, for politic reasons, in the name of his faithful workman Caspar Kaltoff. During 35 years there would be a large accumulation of models for one hundred inventions and several hundreds of experiments, as well as a considerable quantity of tools and machinery. He would certainly choose some place as near as possible to the great mart, where alone he could obtain, within any reasonable time, the numerous articles and materials constantly required in experimental employments; and desiring to be near London, when we find him at Vauxhall in 1663, who can doubt, that he rather continued, than selected for the first time, the locality where we now find the indefatigable noble inventor and his veteran “unparalleled workman,” engaged on the first public example of the “Water-commanding Engine.”