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Globe, to which it is attached, backwards, its Spot 
or ‘Pupil turns upwards ; and again, when the ‘De - 
prejfor is contraded, by drawing its fixed Point back- 
wards, the Pupil is turned downwards. The fame 
may be Paid of the other Mufcles that move the Eye * 
for, as the four firft have their Rife very near one 
another, the Eye with thefe four Mufcles in their 
natural Situation, make the Figure of a Cone, whofe 
Bajis is forwards, and xhcApex backwards ; and there- 
fore each, when it is refpedively contraded, mull 
neceflarily pull the Place of its Attachment back- 
wards, and fo move the Pupil upwards, downwards, 
to the Nofe, or from it; and the Bufinefs of the 
oblique Mufcles is the fame, except w’hat regards the 
Points of their Vellication, whereby they are pulled 
in an oblique Diredion to the four ftraic Motions 
mentioned above. 
XXXII. 
The Eyes are capable of a rotatory Motion, 
which Authors have aferibed to the Power of the 
oblique Mufcles ; but every other Mufcle of the Eye 
contributes to its Rotation as well as thefe, which 
•of themfelves can do no more than the Office af- 
%ned them in the above Defcription ; but that 
Motion is thus perform’d: Let any one look up- 
wards at the Centre of an horizontal Line, on a 
Wall, of feveral Feet long ; he will have it in his 
Power to carry his View along that Line to the 
right or left, to either Extremity, without moving 
his Head. Now the Elevator of each Eye elevates 
the Pupil to the central Point of Vifion mention’d: 
D 2 But 
