toe Congelation of uichjilver . „ y - , 
bounds being removed, by fuch a complete explanation of die 
caufe upon which its anomalous defcent in the lower part of 
t te fcale depends. On this principle there might, perhaps, be 
fome propriety, in conftruding thermometers of mercury, to 
ix the cypher at its point of congelation, and thence reckon 
me degrees of heat upwards. 
. Tlle P rmCl P al advantage, however, of thus patting in re- 
view all former accounts, is to furnilh an important leflon to 
authors, which can never be too ftrongly inculcated, that their 
accuracy mud be brought to the teft of future difcoveries. As 
knowledge advances, their errors, their mifreprefentations, 
their fuppreffion of the truth, or fiditious additions to it, (hall 
all be infallibly deteded, and heap upon their head propor- 
tionable ignominy ; while the Ample and candid narrative, the 
exad and unbiafled relation of fads, will acquire redoubled 
luftre from the fiery trial. Let every author recoiled, that 
the day is impending, when fome unforefeen improvement, 
affording means to lift falfehood from truth, however artfully 
blended, (hall finally decide whether he is to be reprobated with 
the bafe herd of deceivers, or ranked among thofe faithful vo- 
taries of fcience, whofe names will be delivered down with 
honour to pofterity. 
