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sir CHRISTOPHER WREN, knt.

for laying down the Geometry of Sailing, Swimming, Rowing, Flying ,and the Fabricks of Ships .

* c He has invented a very curious and exceeding speedy Way of Etching.

({ He contriv’d a peculiar * Instrument to draw Pcrfpeihve with. He has start-* It the M»-ed several Things towards the Emendation of Water-Works, He has made^wtj Instruments of Respiration ; and for straining the Breath from fuliginous p. 376.

Vapours, to try whether the fame Breath, so purify’d, will serve again.

, A Description of the Vessel for cooling, and percolating - the Air at once,

^ produe’d to the Society , and lest in Mr. Boyle's Hands; by which it ap-^r'd, that something else in Air is requisite for Life, than that it stiould„ e cool only, and free from the fuliginous Vapours and Moisture it was fil-led with, in Expiration ; for, all those were deposited in its Circulation^ough the Inflrument , upon a Suggestion that nitrous Fumes might be^nd requisite, he contriv’d Ways to supply that too, by placing some be-

chymical Spirits, that by fuming might infect the Air within the

t( “ He was the first Inventor of drawing Pictures by microscopical Glasses.

(( 'He has found out perpetual, at least long liv’d Lamps, and Registers of„ Furnaces, and the like, for keeping a perpetual Temper, in order to va-,, nous Uses; as hatching of Eggs, Infects, Production of Plants, chytni-„ eal Preparations, imitating Nature, in producing Fossils and Minerals,t( keeping the Motion of Watches equal, in order to Longitudes and astrono-mical Uses, and infinite other Advantages.

. He made it no small Part of his Business to have a Fire frequently going^ the Elaboratory for choicer Experiments in Chymistry , well knowing that^any Parts of Philosophy are not to be piere’d far into, without this Help j^ little to be done in the Business of Trades without it. Mechanical Phi-?l°phy only teaches us what probably may be done in Nature, by the Mo-. 011 and Figures of the little Particles of Things, but Chymistry helps to de-fine what is actually done by the Motions of those invisible Parts of Li-^Ors, Spirits and Fumes; and oftentimes gives Light enough to contradict. echanical Hypotheses that otherwise seem well grounded. Thus in theody of a Man, if we consider it only mechanically, we may indeed learne b abrick and Action of the organical Parts, hut without Chymistry, wepll be at a Loss to know, what Blood, Spirits and Humours are; from.e due Temper of which, (as of the Spring in the Barrel Wheel) the Mo-t )°»s of all the Part depend. With divers new and useful Experiments in£ ls Art , he had frequent Opportunities of entertaining his Royal Highnesst r f 1Ce Rupert , and his Majesty King Charles the Second, who were both il-( .p kious Spagyrists and Operators. The Prince, as a distinguishing Markj kis Esteem, was pleased to enroll him in a List of such special Friends,h, ykom he Yearly sent a Present of Wine, from his Appenagc on the

The noted Chymist and Rosicrucian Peter Sthael, of Strajburgh, in Life of Ant. aC; ^ °yal~Prustia , was brought to Oxford by the honourable Mr. Robert Boyle, Q° 0 ° n d ’ f) 5 3 5 0 9 '>, An. 1659. Among the chiefest of his Scholars were Dr. John Wallis,t ( 'Hr. Christopher Wren, afterwards a Knight, and an eminent Virtuoso, withothers of great Names in Physick and Learning.c H found out several new geometrical Bodies, that arise by the Applica- - ?><,c, E.U'Osi of two Cylinders, and one lenticular Body sit for grinding one another °f

Vv hose mutual Attrition, will necessarily be produe’d a conoides hyperboli- 287.

(j 7,/> a nd two cyhndroidea hyperbolica. The Engine whereby ttiis may be

being represented in Sculpture in our Philosophical 'TranfaBions, and de- PhilosophicaliSn d for grinding hyperbolical Glasses. ^ansaihom.

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