[ 545 ] . 
Inftruftions to the like effeft were alfo given to 
the other obfervers, fent by the Royal Society to Hud- 
fon’s Bay and the North of Ireland, on the fame oc- 
cafiqn. Sec Phil. Tranf. Vol. LIX, p. 480 — 482. 
and Vol. LX. p. 488. 
“ I ft. Immediately after the firft internal contaift, 
** you are to obferve feveral diameters of Venus 
“ (fuppofe 12) with o of the vernier placed al- 
“ ternately to the right and left hand of the be- 
ginning of the divifions of the fcale. 
2dly, You are to obferve feveral differences of de- 
“ clination of the northern limbs of the Sun and 
“ Venus, and the fouthern limbs of the Sim and 
“ Venus alternately. 
“ Sdly, If there be confiderable time left before the 
“ middle of the tranfit, you are to obferve dif- 
tances of Venus from the Sun’s limb to the 
eaft and weft alternately, in lines parallel to the 
“ equator. 
“ 4thly, If there ftill remain confiderable time be- 
“ fore the middle of the tranfit, you are to ob- 
“ ferve feveral times the horizontal diameter of 
“ the Sun. 
“ 5thly, You are to begin at leaft half an hour (an 
“ hour would be better) before the middle of the 
“ tranfit, to meafure the neareft diftance of Venus 
“ from the Sun’s limb, and the fartheft diftance 
•* of Venus from the Sun’s limb, alternately. 
“ N. B. The fame pofition of the micrometer 
will ferve for both, without turning it 
“ about. Thefe obfervations are to be con- 
“ tinued till the very middle of the tranfit, 
Vol. LXI. 4 A when 
