t 79 ] 
run through it on all fides. The thing 
therefore was to devife fome means 
for preventing this inconveniency, not 
arifing from cracks, but from the fub- 
fiance of which the lamp was made be- 
ing too porous. They made therefore 
a new one, dried it thoroughly in the 
air, then heated it red hot, and after- 
wards quenched it in their kettle, 
wherein they had boiled a quantity of 
flour down to the confidence of thin 
ftarch. The lamp being thus dried and 
filled with melted fat, they now found, 
to their great joy, it did not leak. 
But for greater fecurity, they dipped 
linen rags in their pafte, and with them 
covered all its outiide. Succeeding in 
this attempt, they immediately made ano- 
ther lamp, for fear of an accident, that 
in all events they might not be defli- 
tute of light; and when they had done 
fo much, they thought proper to fave 
the remainder of their flour for fimilar 
pnrpofes. 
