This brief Bohemian Kingship had not yet exploded on the Weissenberg of Prag, [Battle there, Sunday 8th November, 1620.] when old Sir Henry Wotton being sent as Ambassador "to LIE abroad" (as he wittily called it, to his cost) in that Business, saw, in the City of Lintz in the picturesque green country by the shores of the Donau there, an ingenious person, who is now recognizable as one of the remarkablest of mankind, Mr. John Kepler, namely: Keplar as Wotton writes him; addressing the great Lord Bacon (unhappily without strict date of any kind) on that among other subjects. Mr. John's now ever-memorable watching of those _ Motions of the Star Mars,_ [_De Motibus Stellae Martis;_ Prag, 1609.] with "calculations repeated seventy times," and also with Discovery of the Planetary Laws of this Universe, some, ten years ago, appears to be unknown to Wotton and Bacon; but there is something else of Mr. John's devising [It seems, Baptista Porta (of Naples, dead some years before) must have given him the essential hint,--of whom, or whose hint, Mr. John does not happen to inform his Excellency at present.] which deserves attention from an Instaurator of Philosophy:-- "He hath a little black Tent (of what stuff is not much importing)," says the Ambassador, "which he can suddenly set up where he will in a Field; and it is convertible (like a windmill) to all quarters at pleasure; capable of not much more than one man, as I conceive, and perhaps at no great ease; exactly close and dark,--save at one hole, about an inch and a half in the diameter, to which he applies a long perspective Trunk, with the convex glass fitted to the said hole, and the concave taken out at the other end, which extendeth to about the middle of this erected Tent: through which the visible radiations of all the Objects without are intromitted, falling upon a Paper, which is accommodated to receive them; and so he traceth them with his pen in their natural appearance; turning his little Tent round by degrees, till he hath designed the whole Aspect of the Field." [_Reliqui Wottonianae,_ (london 1672), p. 300.]--In fact he hath a CAMERA OBSCURA, and is exhibiting the same for the delectation of Imperial gentlemen lounging that way. Mr. John invents such toys, writes almanacs, practises medicine, for good reasons; his encouragement from the Holy Roman Empire and mankind being only a pension of 18 pounds a year, and that hardly ever paid. An ingenious person, truly, if there ever was one among Adam's Posterity. Just turned of fifty and ill off for cash. This glimpse of him, in his little black tent with perspective glasses, while the Thirty-Years War blazes out, is welcome as a date. WHAT BECAME OF THE CLEVE-JULICH HERITAGE, AND OF THE PREUSSEN ONE.