respecting the next Tables of' Refraction. 



265 



Alt. 



O 



80 



70 



60 



50 



45 



4-0 



SO 



20 



10 



9 



8 



7 



6 



5 



4 



3 



2 



1 







1' 

 1 



2 



5 



5 



6 



7 



8 



9 



11 



14 



18 



24 



33 



F. T. 



10-30 

 21-26 

 33-72 

 48-99 

 58-36 

 9-52 

 40-85 

 39-22 

 20-63 

 54-3 

 35'4 

 25-9 

 31-2 

 55-8 

 50-1 

 30-4 

 25'0 

 25-0 

 51' 



V 

 1 



2 

 5 

 5 

 6 



7 

 8 

 9 

 11 

 14 

 18 

 24 

 36 



Iiessel. 



10-29 

 21-23 

 33-67 

 48-91 

 58-27 

 9-40 

 40-69 

 38-85 

 19-39 

 52-8 

 33-6 

 24-2 

 28-5 

 52-5 

 46-4 

 27-5 

 28-8 

 58-2 

 86-1 



1' 

 1 



2 



6 



7 

 8 

 9 

 11 

 14 

 18 

 24 

 34 



N. T. 



10-30 

 21-26 

 33-72 

 48-99 

 58-36 

 9'52 

 40-85 

 39-16 

 20-19 

 53-8 

 34-7 

 25-4 

 29-8 

 53-8 

 47-i 

 26-0 

 19-6 

 21-8 

 17-S 



All the refractions here set down are reduced to the stand- 

 ard quantities 50°., 30 B. It appears that my refractions are 

 never more than 1 \" different from those of M. Bessel as far 

 as 88° from the zenith : which is a surprising degree of coin- 

 cidence, when we consider that the first were calculated ia 

 the closet, and from a theory depending only upon a few ele- 

 mentary quantities; while the latter were originally deter- 

 mined from Bradley's observations, and have since been ex- 

 perimentally confirmed and corrected. This is an argument 

 in favour of my theory which I could have learnt only very 

 lately ; my paper having been sent to the Royal Society about 

 the middle of June, and the correction of M. Bessel's table 

 being published in the beginning of September following. 

 To this I hope soon to add another confirmation with respect 

 to the constitution of the atmosphere adopted in my paper ; 

 by showing that it agrees with the velocity of sound as de- 

 duced from the satisfactory account of this phenomenon which 

 we owe to Laplace. 



In No. 31 of the same Journal, there is .an article, p. 139, 

 of some parts of which I have also ground to complain. By 

 turning to p. HI, at the bottom the reader will find that the 

 article contains some insinuations and strictures on inv paper 

 by anticipation, before it was printed and published; but 

 what L judge must injurious is at p. 148. In the Philosophi- 

 cal Transactions, J823, p. 1.39, if wr put w = 2, we shall get, 



VoL 68. No. 312. April 1624. LI a = 



