-e General Notes. , [May, 
ing thus accomplished one of two things, it seems to me, is likely 
to happen ; either the vessels will not be well filled or the mass 
intended for one set of vessels will be driven through into the 
other. To avoid these accidents I have practiced the method of 
filling both sets of vessels at the same moment and under exactly 
the same pressure. This pressure is kept low at the beginning so 
that all the arteries and veins shall be thoroughly filled before 
either mass begins to enter the capillaries. Then as the pressure 
is increased the differently colored masses meet each other in the 
capillaries ; and if the pressure on each is equal, the vessels may 
be filled as full as compatible with safety without danger of either 
color being driven from one set of vessels into the other. e 
way in which this result is accomplished will be understood bet- 
ter by reference to the accompanying drawing. The desired press- 
Double-Injecting Apparatus. ` 
ure is secured by allowing a stream of water from a hydrant or 
from an elevated cistern to flow into a tight vessel. A two gal- 
lon petroleum can does quite well. As the water flows in the air 
is forced out through a rubber tube, A, into the wide-mouthed 
bottle, F, whose tightly fitting cork gives passage to two other 
glass tubes. These extend below just through the cork and 
above connect respectively with the rubber tubes Cand D. Into 
the side of F, near the bottom is fitted another tube, Æ, reaching 
toa height of ten inches or more, open above, and graduated into 
inches. If preferred, this tube may also’ pass through the cork 
and extend down well into the mercury with which F is partly 
filled. B is a bottle of suitable size in which is contained a blue 
inj 1 mass for filling the veins, and R a similar bottle contain- 
ing a red mass for the arteries. The interiors of these bottles are 
connected with the bottle F by the tubes Dand C. Each of the 
bottles, B and R, has a tube which, starting from near the bottom, 
>. passes through the cork, and is, a little above this, bent at right 
angles. With these are connected the rubber tubes, Æ and Z. 
