170 M E M O I K S of the 
U'hich motion is not only neceffary for propelling their contents; 
but by the reciprocal contraction of thofe mul'cular fibres of 
the guts, and oppolition of the Valvulde conniventes-, the mouths 
of the la6ieals are difpoled to receive what is prepared for 
them ; hence it is, that we can by no means make any fluid what- 
ever pals from the cavity of the guts into thofe ladleals in a 
dead animal. A farther ufe of this contraction of the mulcular 
fibres of the inteftines, is to accelerate the chyle in its progrefs 
in the laCleals, 'till the Lympha derived from the extremities 
of the arteries of the guts mixes therewith 5 which conjunction is 
made in the laCteals, before they leave the external furface of 
the inteftines. By this means, the progreflion of the chyle is 
made towards the " mefenteric glands, into whole cells it is re- 
ceived, and where it again mixes with a juice conveyed by the 
arteries of each gland j which juice or lymphatic liquor, not only 
farther dilutes the chyle, like that from the arteries of the intef- 
tines, but adds a freih Impetus thereto 5 by which its motion is 
farther promoted thro' the La^ea fecundi Generis, arifing out of 
each mefenteric gland, and difcharging their contents into the 
Rereptaculum Cbyli. Here the chyle mixes with the Lympha^ 
which comes from the lymphseduCls of the inferior limbs and 
neighbouring parts, whereby the chyle is not only farther elabo- 
rated, but its afcent into the thoracic duCt is promoted, whofe 
fcyeral divifions and inofculations, like the veins of the tefticles, 
its number of valves, looking from below upwards, and its ad- 
vantageous iituation between the great artery and Vertebrae of 
the back, together with the lymphasduCts, difcharging their 
Lymph a derived from the lungs and neighbouring parts of the 
thorax, do demonflrate the utmoft art, in order to promote its 
afcent towards the left fubclavian vein. Before the thoracic duCt, 
thus charged with the chyle and Lympha, empties itlelf into the 
fubclavian vein, it receives the Lympha brought from the fupe- 
rior parts ^ all which, mixing together, are loon difcharged into 
the left fubclavian vein, where meeting with the refluent blood of 
the fuperior parts, paffes with it thro' the delcending trunk of the 
Vena cava, and joins with the refluent blood of the inferior 
parts, in the right auricle of the heart 5 whence it is expelled by 
Its contraction into the right ventricle, when the heart is in ^Dia^ 
Jlolej but by the Syjiole, or contraction of the heart, it is thence 
propelled into the Arteria pulmonalis, thro' whole extremities, 
m conjunction with thole of the Vena pulmonalis, it paffes to the 
jeft auricle and ventricle of the heart, from whence it is again 
difcharged in the Sy/iole into the Aorta, by whole branches n is 
cpn- 
