TO W. MACLEAN, ESQ. &c. &c.
In the hands of a man of ordinary dexterity, the common
injecting apparatus alluded to in my last will be found to
answer the purpose perfectly well; but if the practice I
recommend is, as I hope it will be, generally adopted, it will,
I conceive, be expedient to advise that a regular and perfect
transfusion apparatus be used; at all events, to warn those
who inject to beware of allowing air to get into the vein. The
tubes, of course, must be filled with fluid, as well as the
pipe in the vein, before commencing, and considerably more
fluid than it is intended to use ought to be in the vessel from
which it is pumped.