operation of cathartics. Sea-voyages. Equitation 
CAT. | 56 
on by cathartics. Doses requisite in the tropics 
andin high northern latitudes. Large doses used 
by army and navy surgeons of the East Indies. 
Different methods of employing cathartics, as in 
the suppository, substance, tincture, infusion, in- 
jections. Injecting fumes of certain narcotics as 
cathartics ; attended with danger. 
Diseases in which these different forms are resor-— 
ted to.. Effect ofepispastics, as aids to purging in 
obstinate constipation ; either over the belly, or 
remote from it; even on the extremities. Of ileus. 
Effect of gestation of certain kinds in resisting the 
to those unaccustomed to it, first induces costive- 
_ ness; when habitual keeps the belly open. Effects” 
ofequitation observed in the dragoon recruits under 
my care, in the beginning of the war. Hyper-ca- 
tharsis, in what kind of temperaments most likely 
to occur. Previous blood-letting enhances t 
activity of purgatives, and these latter promote 
the action of diuretics. How and under what cir-_ 
cumstances they do this. : 
Purgatives diminish the action of the sangu 
erous system, remove torpor in its operations, and 
restore its balance of power; they determine the 
circulation from the head to the extremities. The 
two-fold manner in which this is effected, notice 
They promote the absorption of fluids, from — 
ternal cavaties. In like manner produced by: 
two-fold operation. How they excite absorptit 
in cases of dropsical effusion. They increase thé 
portal circulation, aie 
