274 Mr. herschel on the proper Motion 
Hence we may in a general way eftimate, that the Solar motion 
can certainly not be lefs than that which the earth has in her 
annual orbit. 
1 have now only to add, that it is to be expected future obfer- 
vations will foon throw more light upon this interefling Subject, 
and either fully eftabiifh or overturn the hypothecs* ot the 
motion of the whole folar fyftem. To tins end I have already > 
begun a feries of observation upon Several zones of double 
Stars ; and fhould the refult of them be againft thefe con- 
jectures, 1 flaall be the fir ft to endeavour to point out the. fallacy? 
of them. 
Datchet near Windfor, 
Vcb. i, 1783. 
Voftfcrlpt to the Paper on the Motion of the Solar Syjtem «• 
In my paper on the Motion of the Solar Syftem,-! uled a 
table of the proper motion of Some fixed ftars, which M. 
de la lande has given us as an extra# from tob. mayer’s 
Opera inedita. By the favour of my aftronomical friend Mr. 
aubert, I am now furniftied with the fcarce edition of the 
original. This work contains a catalogue of theplace of 80 ftars, 
obferved by Mr. mayer in 1756, and compared with the fame 
ftars as given by roemer in 1 706. From the goodnefs of the in- 
ftrument with which the obfervations to which Mr. mayer has 
compared his own were made, he gives it as his opinion, that 
where the disagreement in the place of a ftar is but Small, it 
may 
