266 RETROGRADE SECT. XXIX. 8. z. 



2. Whenever the fecretion of any fluid is increafed, there is 

 at the fame time an increafed heat in the part ; for the fecreted 

 fluid, as the bile, did not previously exilt in the mafs of blood, 

 but a new combination is produced in the gland. Now as folu- 

 tions are attended with cold, fo combinations are attended x vith 

 heat ; and it is probable the fum of the heat given out by all the 

 fecreted fluids of animal bodies may be the caufe of their gen- 

 eral heat above that of the atmofphere. 



Hence the fluids derived from increafed fecretions are read- 

 ily diftinguiihed from thofe originating from the retrograde mo- 

 tions of the lymphatics : thus an increafe of heat of either in the 

 difeafed parts, or diffufed over the whole body, is perceptible, 

 when copious bilious ftoois are confequent to an inflamed liver ; 

 or a copious mucous falivation from the inflammatory angina. 



3. When any fecreted fluid is produced in an unufual quanti- 

 ty, and at the fame time the power of abforption is increafed in 

 equal proportion, not only the heat of the giand becomes more 

 intenfe, but the fecreted fluid becomes thicker and milder, its 

 thinner and faline parts being re-abforbed : and thefe are dif- 

 tinguifhable both by their greater confidence, and by their heat, 

 from the fluids, which are effiifed by the retrograde motions of 

 the lymphatics ; as is obfervable towards the termination of gon- 

 orrhoea, catarrh, chincough., and in thofe ulcers, which are faid 

 to abound with laudable pus. 



4. When chyle is obferved in ftoois, or among the materials 

 ejeded by vomit, we may be confident it muft have been 

 brought thither by the retrograde motions of the la&eals ; for 

 chyle does not previoufly exift amid the contents of the intef- 

 tines, but is made in the very mouths of the lafteals, as was be- 

 fore explained. 



5. When chyle, milk, or other extraneous fluids are found in 

 the urinary bladder, or in any other excretory receptable of a 

 gland ; no one can for a moment believe that thefe have been 

 collected from the mafs of blood by a morbid fecretion, as it con- 

 tradicts all analogy. 



Aurea dura 



Mala ferant quercus ? Narcifco floreat ainus ? 

 Pinguia corticibus fudent ele&ra myiica; ? 



VIRGIL. 



IX. Retrograde Motions of Vegetable Juices. 



THERE are bcfides fome motions of the fap of vegetables, 

 which bear analogy to our prefent fubjed ; and as the vegeta- 

 ble tribes are by many philosophers held to be inferiour animals, 



U 



