164 Hcemajlatics. 
a Dropfy a great deal of Water is at once 
drawn off by Tapping, the Patient is then in 
danger of dying in the Operation ; for which 
reafon, when the Qtiancity of Water is large, 
it is drawn off not at once but at feveral 
times, chat in the Intervals the dilated Parts 
of the Abdomen may have time to contraft, 
and thereby duly comprefs the Blood-vefTels ; 
which are there made large and capacious, 
that they may be fit to receive the greater 
Stores, with which they are repleniflied fome- 
time after Meals. 
15?. And thus alfo the fmall Evacuation of 
a Clyfter will fometimes caufe a fick Perfon to 
faint, or to be ready to faint ; an Argument 
that the vital Force of the Blood does then 
run low. 
20. Thus alfo a natural Loofenefs or a Purge 
do very fenfibly rebate the Vigour of the 
Blood, by too much evacuating the Abdomen^ 
as well as by the extraordinary Qiiantity of 
Fluid, that is in thofe Cafes difeharged from 
the Blood into the inteftinal Tube. In which 
greatly rebated State of the Blood, the Surface 
of the Body being thereby reduced from a vi- 
*goroufly perfpiring, even fometimes to an im- 
bibing State, we are thereby the more fubjed to 
_2i. When 
