An Extract 
Of a Letter^ lately written by Monfieur Louys de Bills U 
D. Tobias Andrew Profefforof Phjfick and Philefo- 
fh) at Duysborgh en the Rhyn touching the true 
Ufe of the Lymphatick-/^/*, &c. 
THe Veffels,commonly called Lymphatick, have two Coates^ 
betwixt which there are innumerable very fmall and very 
fine veffels like Filaments, refembling the Mofle of Trees, with- 
out any Valves, containing a nutritious Juyce conveyed into all 
the parts of the Body by a motion thereof from the center to 
the circumference $ but returning through the inner pipes (fur- 
niflit with Valves?) of the fame Water- veffels ^ at which time 
they are no more to be call'd Water or Dew, but Ferment, t>e 
veffels deferving alfo the name of Ferment- veffels. This Fer- 
ment ferves to keep the Blood, and to ferment the fame, being 
convey'd into it by a motion contrary to the former, viz. from 
the circumference to the center $ which I can prove by Ocular 
demonftration, having already fhew'd it to Dr. Stalfarts Van der 
- Wiele and many others, in the jugular Glanduls taken out of a 
Dogg ; wherein I fhew'd them , that thefe Lymphatick veffels 
carry their dewy particles about the Glanduls between the two 
T unicles, and that in the lowermoft end of thefe Glanduls the 
Ferment- veffl takes its beginning, being iaclofed in thefe Dewy 
Veffels, and fo conflicting the inner pipe together with the 
Valves, which are of another forme, than hath been known hi- 
therto. 
To your gu&re^ Whether thefaid Ferment-vtffels difcharge 
at laft all their Ferment into the Ductus Thoracicus, thence to be 
carry'd diredtfy to the Heart, there to increafe and to ferment 
the Blood, or whether they communicate their Ferment to o- 
ther parts alfo? I anfwer, that moll of the Juyce of the Mil- 
ky veffels is difchaiged between the Tunicles of the Veines, Ar- 
teries, Lywphaticks, Uemhrans, and the veffels in the Mefentery , 
to be conveyed into all the parts of the Body 0 both Internal 
and External. For even in hearing Females the Fruit is no: 
oomiflVd by any Blood, but by the nutritious Juyce, conveyed 
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