49^ ESSAYS AND OBSERVATIONS 



fes. But, if no farther circumftance, 

 tending to retard the heart's motion, were 

 found ill fleep, the pulle Ihould be equal- 

 ly flow and full in a waking perfon lying 

 at reft in a horizontal pofture, and whofe 

 mind is compofed, as in the fame perfon 

 in time of fleep ; which, however, does 

 not feera to be entirely the cafe: For, 

 though the difference may be fmall, and 

 there may be many caufes which may 

 render it difficult, by obfervation, to de- 

 termine that difference with any degree 

 of certainty ; yet the remarkable flownefs 

 and fulnefs of the pulfe in the deep fleep, 

 accompanying an apoplexy or occafioned 

 by opium, makes it highly probable, that, 

 even in the much gentler fleep of perfons 

 in health, the pulfe is fomewhat flower 

 and fuller, than it would be, merely 

 from the compofure of mind, horizontal 

 pofition of the body, and quiefcence of 

 the mufcles of voluntary motion. Let us 

 therefore fee, whether the flownefs and 

 fulnefs of the heart's motion in time of 

 fleep, may not be in part owing to fome 



diminu- 



