LYMPH. 



467 



Schmidt gives the following analysis of the lymph of a cow : — 



Serum 95.53 



Clot, 4.42 



"Water, . 

 Fibrin, . 

 Other albumens, 

 Fats, 



Organic matter, 

 Salts, 



Sodic chloride, 

 Soda, 

 Potash, . 

 Sulphuric and phosphoric acids 

 earthy phosphates, . 



i 100 parts 



In 100 parts 



Serum. 



Clot. 



95.76 



90.73 





4.86 



3.20 





0.12 



3.43 



0.17 





0.74 



0.96 



0.56 



0.60 



0.13 



0.06 



0.01 



0.10 



and 



0.04 



0.23 



The lymph further differs in composition according to the locality 

 from which it is collected. The following table gives the composition 

 of the lymph of the horse : — 



Water, . 

 Solids, . 



Lymph 



Collected from 



the Femoral 



Vessels 

 (Gmelin). 



964.30 

 35.70 



Lymph. 

 Collected from 



the Cervical 

 Vessels (Leuret 

 and Lassaigne). 



925.00 



75.00 



Lymph 

 Collected from 

 the Vessels of 



the Foot 

 (Geiger). 



983.70 



16.30 



Lymph from 

 the "V essels of 

 the Foot of an 



Ass (Rees). 



-965.36 

 34.64 



Fibrin, 



1.90 



3.30 



0.40 



1.20 



Albumen, 



21.17 



57.36 



6.20 



12.00 



Fats, . 



traces 





traces 



traces 



Extractives, 







2.70 



15.69 



Inorganic matters, 



10.63 



14.34 



7.00 ■ 



5.85 



The Circulation of the Lymph. — The lymph is continually moving 

 in the lymphatic vessels in a slow stream from the lymphatic radicals to 

 the larger lymphatic trunks, and thence into the large veins in the neigh- 

 borhood of the heart, motion being due to the difference in pressures be- 

 tween the lymphatic capillaries and the entrance of the lymph-trunks 

 into the veins. 



Since the lymph originates as a transudation from the blood-vessels 

 in the interstitial spaces, the pressure to which it is subjected will be 

 nearly identical to the pressure in the blood-vessels which causes its pas- 

 sage through the vascular walls. Each volume of lymph will, therefore, 

 be forced onward by the amounts which succeed it under a pressure 

 which is nearly equal to the blood pressure. On the other hand, the 

 pressure of the lymph at the points of entrance of the lymphatics into 

 the veins will be in all cases slight, and sometimes will be even negative ; 

 for during inspiration the expanding thorax aspirates the blood from 



