[ 5°4 ] 
two Seconds; with two Ounces, in three Seconds ; 
with three Ounces, in four Seconds. 
In a Decoftion of warm Barley-water, which was 
fo thick as to be a tender jelly when cold, the Stone 
was forty-five Seconds in defcending, that is, thirty- 
five times flower than in Urine ; and, confequently, 
the impelling Force of Urine is thirty five times lefs 
than that of this Mucilage, in cafe their Velocities 
were equal. 
This Mucilage was, aslguefs, of a due Confidence 
for the Purpofe ; for it was about the Thickncfs of 
Lord Orford's coagulated Blood and Urine. Equal 
Quantities of Blood and Urine will continue a thick 
Coagulum for many Weeks, without any Separation. 
But as the Velocity, with which fuch mucilaginous 
Subdances pafs thro’ fmall Tubes, is confiderably lefs 
than the Velocity with which Urine will pafs; fup- 
pofing the Forces with which they are impelled to 
be equal ; it was requifite to determine thofe dif- 
ferent Velocities by Experiments: And, in order to 
it, I put half a Pint of the fame blood-warm De- 
coction of Barley into a glafs Vedel, where its 
Depth was near eight inches, and therefore its mean 
Depth near four Inches. It run out at the Bottom in 
about fifty Seconds thro 1 a glafs Tube, whofe Bore 
was yth Inch Diameter ; its Length two Inches : 
And, on repeating the fame Experiment twice, as 
the Deco&ion grew cooler and cooler, it was about 
eighty and then ninety Seconds in running out ; 
whereas a like Quantity of Urine ran out thro’ the 
fame Tube in eighteen Seconds. 
Now, fuppoiing the Velocities, at a Medium , 
thro’ the Urethra , to be as fevenry-two to eighteen, 
then the Velocity of the Urine will be three Fourths 
greater 
