SECT. XXIX. 2. RETROGRADE ABSORBANTS. 353 



Thefe valves do not however Appear to be necef- 

 fary to all the abforbents, any more than to all the 

 veins ; fmce they are not found to exiit in the ab- 

 forbent fyftem of fifh ; according to the difcoveri-es 

 of the ingenious, and much lamented Mr. Hewfon. 

 Philof. Tranf. v. 59, Enquiries into the Lymph. 

 Syft. p. 94. 



3. Thefe abforbent veffels are alfo furnimed with 

 glands, which are called conglobate glands ; whofe 

 ufe is not at prefent fufficiently inveftigated ; but it 

 is probable that they refemble the conglomerate 

 glands both in ftru&ure and, in ufe, except that their 

 abforbent mouths are for the conveniency of fitua- 

 tion placed at a greater diftance from the body of 

 the gland. The conglomerate glands open their 

 mouths immediately into the fanguiferous veffels, 

 which bring the blood, from whence they abforb 

 their refpe&ive fluids, quite up to the gland : but 

 thefe conglobate glands collect their adapted fluids 

 from very diftant membranes, or cyfts,' by means 

 of mouths furnimed with long necks for this pur- 

 pofej and which are called lac!eals ? or lympha- 

 tics. 



4. The fluids, thus collected from various parts 

 of the body, pafs by means of the thoracic duft 

 into the left fubciavian near the jugular vein j ex- 

 cept indeed that thofe collected from the right fide 

 of the head and neck, and from the right arm, are 

 carried into the right fubclavian yein : and fome- 

 times even the lymphatics from the right fide of the 

 lungs are inferted into the right fubclavian vein ; 

 whilft thofe of the left fide of the head open but 

 juft into the fummit of the thoracic duel. 



5. In the abforbent fyftem there are many anafto- 

 mofes of the vefifels, which feem of great confe- 

 quence to the prefervation of health. Thefe anafto- 

 mofes are discovered by diflection to be very fre- 

 quent between the inteflinal and urinary lympha- 

 tics 



