penis is held by the other.
The meatus being found--there is no great ingenuity required to discover
it--the instrument is inserted and pushed gently onward. At first its
passage is easy, but it has not gone far before a check is felt. The
stoppage arises from the spasmodic contraction of the canal, caused by the
point of the instrument having reached the bone of the penis. For a period
the passage is effectually closed; but no force must be employed to
overcome the obstacle. Gentle but steady pressure is kept up; and under
this it is rarely longer than a few minutes before the spasm yields. The
catheter then glides forward, and the operator, resigning the hold of the
penis to his assistant, passes his free hand to the perinaeum. When he
feels the point of the tube below the anus, he uses his fingers to direct
its course,--for at this part the canal curves, taking a direction
forward,--and after a little further way has been made, another check is
experienced. This last springs from the contraction of the neck of the
bladder; and once more gentle, but steady pressure must he employed to
overcome the spasm. It rarely resists long; but the sudden absence of all
opposition, and the flow of urine, shows that the object of the operation
has been obtained.

The dog offers no resistance to the passage of the instrument. I have
never known one to cry, or seen one exhibit a struggle. I could not
account for this by attributing it to any fondness for the necessary
restraint, under which the creature is temporarily placed. During the
flowing of the urine, the dog invariably remains perfectly quiet; and the
relief afforded seems to dispose it almost to sleep; for after it is over,
the animal lies in a kind of happy lethargy. The fluid, however, does not
jet forth or empty quickly. The operator must not be impatient, for the
stream is perfectly passive; since, in consequence of the distension, the
bladder has lost its contractive power. To obtain the whole of the
contents, has sometimes required a quarter of an hour, and the quantity
procured has frequently been quite disproportioned to the size of the
patient. From a small petted spaniel, brought under my notice by my
friend, Mr. Henderson, I extracted very nearly half a pint of urine, and
the animal from that period began to get well. From a very small dog, the
property of a lady of fortune, I for several days, every night and
morning, withdrew about four ounces of the excretion w