aga Mijcellanea Curiofa. 



jl Trofofal concerning the Tarallax 

 of the fixed Stars, in Reference 

 to the Earths Annual Orb. In 

 fever al Letters of May the ad. 

 June 29. and July 20.1693. frarc 

 *£>r. John Wallis to William 

 Molineux Efy; 



SIR, 



I Am obliged to you for two Books which 

 you have been pleafed to fend me, that 

 of your Sciothericum Telefcopcum, and that of 

 Diopricks\ which you have performed fo well, 

 that I have not been better fatisfied with any 

 that I have feen of that Subject. I mould not 

 fo long have neglected to return my Thanks 

 for them, but that I thought a Letter of bare, 

 Thanks to be too empty, unlefs I had fome- 

 what elfe to fend with it. 



You will, I hope, give me leave (though I 

 have not the opportunity of being perfonally 

 known to you) to fuggeft a Speculation, which 

 hath been in my Thoughts thefe Forty Years 

 or more *, but I have not had the opportu- 

 nity of reducing it to Pra&ice, as being not 

 fo well ftored with necefTary Inftruments of 

 that kind, nor much exercifed to Telefcopick 

 Obfervations. And though I have many 

 Years lince fuggefted it to others, yet nei- 

 ther 



