[ io ° 3 
tation, that the difference of variation in declination 
between the times of obfervation was 34 ", 5 > by 
which quantity the difference of declination was di- 
minifhed, and fhould therefore in 1768 have been 
3° o' 59", 4. But it was 2 0 58' 24^,2 by adual 
obfervation. Ardurus therefore by this obfervation 
has moved fouthward 2' 3 5", 2 in 78,255 years. 
By the foregoing comparifons Ardurus appears to 
have moved as in the following table. 
Weflwd. Southwd. 
years. ' " ' " 
By the fmall ftar Feb. 14, 1690,111 77,237 
1 5*>35 
2 35,0 
» Bootis Feb. 14, 1690, in 78,257 
1 18,8 
2 6,3 
r/ > Bootis Apr. 5, 1691, in 77,120 
1 3i,S 
2 5>3 
Bootis May 4, 1691, in 77,071 
J 3A8 
2 10,3 
Bootis May 27, 1692, in 75,978 
1 28,4 
2 9>3 
By tt Bootis May 27, 1692, in 75,978 
1 34=2 
2 33>° 
^ Bootis Feb. 14, 1690, in 78,257 
not obf, 
2 35> 2 
As the quantity of the motion of Ardurus fouth- 
ward in declination, as deduced from a comparifon 
with 7] Bootis, differs confiderably from the quanti- 
ties given by the fmall ftar and Bootis, which agree 
very nearly together, I have compared vj Bootis with 
fome of the neighbouring ffars, as that ftar, though 
of the third magnitude only, may have a fmall motion 
of its own. 
On the 14th of February, 1690, the difference of 
declination between tj and n Bootis was obferved by 
Mr. Fiamfteed to be = 2 0 , 1 / 47", 8. By compu- 
tation, that difference in 1768 fhould have been 
2/ 43 // ,9 lefs, — 2 0 g r 3", 9 : but it was adually 
obferved 
