380 ANATOMICAL PREPARATIONS 
But the method I have difcovered, and always practifed 
as the fafeft and beft, is to make ufe of a {mall fyringe, 
the pifton whereof works eafily, with which, whilft the 
preparation is covered three or four inches over with wa- 
ter, I fyringe gently, fo as to wafh and clean it entirely 
from the corroded fubftance which is but loofely attached 
to it. In this manner, ufing proper care, it may be per=- 
formed perfe@ly without breaking down any, even the 
fineft parts, of the tender veffels. 
But if more force than needful is employed, even athe 
droppings of a pump from a too great height, when the 
preparation is taken out of the water, will fometimes break 
down the extremities of the {mall veffels, and mar the 
beauty of it. 
After all thefe dire€tions have been well executed, the 
preparation is to be fufpended for fome time in a fafe place, 
till it is dry ; then it is to be fixed on a wooden pedeftal, 
having a focket like a candleftick, in which it may be faft- 
ened with a little glue or melted wax. Then let it be co- 
vered with a tranfparent glafs in form of a globe or bell, 
with the mouth downward, to guard it from accidents. 
This finifhes the work. 
Thefe preparations give us a moft exact knowledge of 
all the ramifications and anaftomofes of the veflels, and 
often of the junction of the arterial and venal fyftem, when 
the injection is fine enough, and fo fuccefstully thrown 
from the arterial trunk as to penetrate into the veins and 
fill that fyftem of veffels in the organ prepared, complete - 
ly, at one and the fame time. ‘Thus I have filled both the 
emulgent arterial and venal fyftem of veffels, ina kidney, 
at one coup de main, through a fingle pipe fixed in the 
great trunk of the emulgent artery, the correfponding 
trunk of the vein being fhut up witha ligature. But it is 
more common for the injection made by the artery to ftop 
at the extremities of the evanefcent branches, and to fill 
the venal fyftem by a fecond injection, drove through the 
great trunk of the emulgent vein. 
Upon 
