C 2 24 3 
31 few minutes after it is made, efpecially if the bird has 
been well fed three or four hours before the experi- 
ment. The lymphatics in the neck may be (hewn 
in the fame manner ; that is, by making a ligature 
on the jugular vein at the lower part of the neck ; 
and to be more certain of including the lymphatics, 
which are near it, we muft take care not to pafs the 
needle too clofe to that vefiel. When they are to be 
injected, they muft be opened at a convenient part, 
and a proper pipe fixed in them for that purpofe. 
For the greater fatisfadfion of thofe who may think 
this paper worthy their attention, I have prepared 
two birds, whofe lymphatic fyftems are filled with 
quick-filver, in order to be compared with the 
figure : thefe have already been fhewn to feveral 
members of the learned Society, who honoured me 
with their prefence whilft the fubjedts were frelh ; and 
who, I flatter myfelf, were then fatisfied with the ex- 
adlncfs of the drawing. 
Mr. Hewfon begs leave to add, that fince the 
above paper on the lymphatic fyftern in birds 
was put into the hands of the fecretary of 
the Royal Society, he has difeovered the fame 
fyftern in fifh ; and has likewife been fo for- 
tunate as to procure a Turtle, whofe lymphatic 
fyftern he has traced out, and has got deli- 
neated. An account of thofe difledtions, with 
the figures, he intends foon to have the ho- 
nour of laying before the Society. 
Windmill Street, Dec. 3, 
1768. 
Expla- 
