APPENDIX TO THE PREFACE. 



IT may be interesting to give a few extracts from the Newton 

 papers on some of the subjects which have been referred to in the 

 above Preface. These relate to 



I. The form of the Solid of Least Resistance. Principia, 



Lib. II. Prop. 35, Schol. 



II. A List of Propositions in the Lunar Theory intended 



to be inserted in a second edition of the Principia. 



III. The motion of the Apogee in an elliptic orbit of very 



small eccentricity, caused by given disturbing forces. 



I. ON THE FORM OF THE SOLID OF LEAST RESISTANCE. 

 LIB. II., PROP. XXXV. SCHOL., p. 326, 1st Ed. 



Draft of a Letter in Newton's hand, no doubt to Professor David 

 Gregory, and probably written in 1694. 



SIR, 



I now thank you heartily both for the very kind visit 

 you made me here and for the errata you gave me notice of in my 

 book and also for your care of Mr Paget's business. The Lem. 1 

 in the third book I could not recover as tis there stated, but I have 

 don't another way with a Demonstration, and altered very much the 

 Proposition which follows upon it concerning the precession of the 

 Equinox. The whole is too long to set down. The figure which 

 feels the least resistance in the Schol. of Prop. xxxv. Lib. n. is 

 demonstrable by these steps. 



