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rom the ventilator through the furnace, which 
oils the water in the body of the hill. 
Dear Sir, 
Your mod: aftedionate and 
mod: obedient fervant, 
W. Brownrigg. 
Thoughts oft the Rev Dr. Hales’* new Method of Di- 
li illation by the united Force of Air and Fire. 
Re'd Feb. 26 , j N the procefs of diddling fea- water,, as 
^ JL defended by the reverend Dr. Hales 
the great increafe of vapour raifed by. his method’ 
above what is raifed by the. common method of 
didillation, may be attributed, chiefly, to the vio- 
lent ^agitation of the water contained in the body 
of the dill, by the motion of the air continua’ly 
prefled through it Although the air, by at.rad- 
ing the watry particles, may alfo contribute to 
produce this effed. Ic is, however certain, that a 
Ample, mechanical agitation of warm water will 
greatly promote its evaporation, by increafing its fur- 
face, from whence the vapours, arife, and by putting 
i-s heated particles in a brifker motion, and exciting 
between tnem adions and readions, and fo difpodn? 
them to fly off in eladic vapours.. 
Of this we have indances in warm water, when 
Airred about in veflels, or poured out of one veiTel 
into another j from which the vapours viflbly arife 
