[ 395 ] 
we may, with a little trouble, blow into the mouths 
of thefe veffels, fmall as they are j or introduce a fine 
briftle into them, if we have but a heady hand and a 
good eye. I have frequently done both, in the pre- 
fence of many witneflTes ; fo that, without ufing the 
knife or lancet, the lead force or violence, air maj 
be thrown into the lymphatics from their very be- 
ginnings ; and mercury may be made to pafs by the 
'l^mc orifices* 
Though I have faid we may eafily have an ocular 
demonftration of the origin or mouth of the lympha- 
tic, in this part of the human body, 1 rnuft contefs, 
it is not always we can have that fatisfi^ion : no part 
is more frequently difeafed : inflammation folders up 
the mouths of thefe little veflels ; and it is not to be.. 
expeded we can fhew their orifices when the urethra 
is in fuch a date. 
It will always require fome dexterity to catch the 
opening of the lymphatic; but the biidie, once fairly, 
introduced, will generally pafs with great eafe fome. 
way within the vefieh. 
Here then we may fatisfy ourfelves in what manner 
the lymphatics do adually begin from furfaces . and- 
to thofe who,, without ever having feen the. origin of a. 
lymphatic, have neverthelefs realoned fo well, and fo 
iuffly, upon this fubjed, it may perhaps afford fome 
pleafure and fatisfadion to find their conjedures agiee- 
ing fo perfedly with, the ftrudure. 
The fituation of the lymphatics,, in general,. is fa- 
perficial ; that is to fay, they are moftly to be feen upori' 
furfaces ; though there are lome deeper feated ones, 
which accompany the blood vdfels. They have been 
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