62 Mr Murray on the Temperature of' the Egg of the Hen. 
this way, I can readily discriminate between the colours , in re- 
lation to differently coloured petals in flowers ; and, moreover, 
it was thus that Mr John Gough of Kendal, though blind, 
determined the temperature evolved in the dilatation and con- 
traction of caoutchouc, for which see his paper in the Transac- 
tions of the Manchester Philosophical Society. 
The cause of this unequal distribution may be clearly traced 
to the cicatricula , from which the caloric seems to radiate. 
When we puncture the shell, the cicatricula may be discovered 
floating in the albumen , on the acclivity of the vitellus , and 
near the summit of the globe toward the great end. 
In the following experiments, the projecting minute ball of 
the thermometer was very cautiously and carefully immersed 
into the albumen, when the shell at either end was broken to 
allow its introduction. The external atmosphere was at same 
time registered. 
External air, 52° F. 
Small end of egg, 58°.5, fths of an inch deep, 60° 
Great end, 59°, 60 
Small end, - 56°.5, deep, 58° 
Great end, - 58°, 58°.5 
Air, 63°5 
Vitellus, 64°.5 I T 
Albumen, 64°.5 j 
In these the thermometer was deeply immersed, and it is evi- 
dent that the difference does not arise from the vitellus or al- 
bumen, or aiiy specific phenomenon connected with them indi- 
vidually. 
Small end, 58°5, immersed, 61°.5 + 
Great end, 60°, — - 61°.5 + 
From side to centre, 65° 
In another, - 64° 
Air, 52° -{- 
Small end, 57°*75, immersed, 58°.5 
Great end, 58°.5, — — 58°.75 
Air, 54° 
Small end, 58°.5, immersed, 59°.5 
Great end, 59°.5, 59°.75 
Air, 52° 
Small end, 58°.5, immersed, 59°.25 
Great end, 59° -f — . 60° 
Small end, 85° F. 
Do. 1 in. 87°5 
Great end, 88° F. 
Do. 1 in. 93° 
In the region of the cicatrice, 91°.5 
Air of the room, - 73° 
Thermometer sunk to 55°.5 by the evaporation of the albumen. 
another. 
, f66°. 
’ ( 66 °. 
