-45

sir CHRISTOPHER WREN, knt.

sis datis : segmenta ejusdem lincœ, (ft opus eft) produBce, £? intra tranfversumaxem & ellipsn terminate ?, in numeris inventre.

After the Solution of this Problem, Mr. Wren in the fame Paper subjoinsthe following (propos’d formerly by Kepler) which he had himself solvedgeometrically, [vid. Wallis ubi supra , Page 540.] Aream datam semicirculidati, vel ellipfe u s data, ex quoeunque punBo diametri cujujcunque , etiam fe li -bet produBa, in data ratione secure. And he adds : Rogo igitur præsantis-ftmos in Gallia mathematicos, ut problema Keplerianum J’olvere dignentur , nu-merice quidem, sifieri posit saltern geometrice t

6. A Method for the Construction of solar Eclipses.

This was difeover’d by him in the Year 1660, and afterwards publistfdhy Mr. Flamftead, in his DoBrine of the Sphere ; and has now for manyVears been generally follow’d, as the most concise and plain. See Sir JonasMoor’s System of the Mathematicks, London 1681, Quarto.

7. Cerebri & Calvariœ figura eruditiftime [proprtis manibus ] delineata.

These Figures were drawn at the Desire of Dr. Willis, for the Use of hisExcellent Treatise, intitled Cerebri Anatome, publistsd in 1664; of whichthe learned Author has given Account in his Preface. [ Prater suppetias , &c.]

8. An architectonical Account of the cathedral Church of Salisbury ; withthemes for the Repairs.

The original Manuscript of this, in the Author’s own Hand, and dated*668, is yet in the Registry of the Dean and Chapter there. And it hasbe en since publish'd in a Book intitled, The Hisory and Antiquities of the ca -tjftdral Church of Salisbury, and the Abbey-church of Bath, London 1723,Octavo. Where it is called, " An excellent Piece wrote by an eminent' Gentleman, who was invited thither by Dr. [Bishop] Ward, in 1668.[for his Opinion and Instructions for the Repairs,] " Where he then made'' the Survey.

Besides these, the following Papers, communicated by him to the RoyaLsociety, are all of them, except the last, printed in their Transactions.

1. A Way to convey Liquors immediately into the Mass of Blood, No. VII.^ 1 28. December 1665.

2. Lex natura de colliftone corporum , No. XLIII. p. 867, December 1668.^ his is a Theory of what the Author had before proved by Experiments.

j 3 > A Description of an Instrument for drawing the out Lines of any Ob-e< ^ in Perspective, No. XLV. p. 898, March 1669.

4 - Generatio corporis cylindroidis hyperbolici, laborandis lentibus hyperbolicisc ^n m odati, No. XLVIII. p. 961. June 1669.

^ 5 - A Description of an Engine design’d for grinding hyperbolical Glasses,LlII. p. 1059, November 1669.

c j A Letter concerning the finding a straight Line equal to that of a Cy-in 1658, No. XCVIII. p. 6156, November 1673.

r * 7. An