Sir Everard Home's observations 
s 94r 
Plate XXII. 
This Plate contains two figures, giving different views of 
a stricture in the urethra. The stricture had become so 
narrow, that a piece of gravel was prevented from passing, 
and had imbedded itself in a cul de sac immediately 
behind the stricture. This piece of gravel increased in size 
by receiving additions from the urine that passed over 
it; and the stream, every time of making water, turning it 
round in its bed, it acquired a spherical form. The patient 
never having had any attempts made for his relief, and 
being seized all at once with a complete suppression, died ; 
after death, the calculus was found closing up the orifice of 
the stricture. Both figures are magnified five diameters. 
Fig. i A transverse section of the urethra a little beyond 
the stricture, showing from behind the aperture which the 
stone closed up, and giving a side view of the cul de sac in 
which it had usually remained. This cavity is not made by 
a fold of the internal membrane, but by an exudation of 
coagulable lymph forming a sac. 
The other parts are the same as have been already de- 
scribed in the transverse sections of the urethra, in a natural 
state. 
Fig. 2. Represents the urethra laid open from above, in a 
longitudinal direction. The right hand portion exhibits the 
newly formed coagulable lymph produced by the irrita- 
tion of the stone ; the serrated processes of coagulable lymph 
projecting from the internal membrane, which is itself thick- 
ened, and pressed forward by the swell of the muscular 
structure surrounding it, are also distinctly seen. The na- 
