Chap. VI.] OF LIVING LIQUIDS. 73 



fellowship witli it the presence of the leucocytes in the lymph, 

 their greater number after that this lymph has passed through 

 the ganglions, the swelling of these ganglions, either of the 

 liver or of the spleen in leucocythsemia, we should be tempted 

 to consider these glands and these ganglions as the original 

 sources, as the centres of creation of the sanguineous globules, 

 which before taking the red tint, before growing retractile, to 

 assume the form of hsematia, begin by being leucocytes. 



In leuoocythiemia there would seem to be a superabundance 

 of globular formation, while these elements are more voluminous, 

 blended with a great number of free globulines. Hence the 

 difficulty of their transformation into red globules. 



7. — Of tlie Lymph. 



It is a familiar fact that besides the grand circulatory system, 

 composed of arteries, of veins, in which a propulsive organ, the 

 heart, drives incessantly the blood on, there exists in the superior 

 vertebrates a second circulatory system, without central organ of 

 propulsion. This system, composed of an immense and fine 

 network, which is bestrewn with special glands, called ganglions, 

 has its origin partly in the mechanism of the tissues, and 

 especially on the surface of the membranes, partly around the 

 thinnest sanguineous vessels, the capillaries. In this lymphatic 

 system circulates slowly a yellowish, transparent plasma, convey- 

 ing white globules, and containing, like the blood, immediate 

 principles of the three classes : it is the lymph. The materials 

 of the lymph come, in chief part, like those of the blood, from 

 anatomical elements, and they come from them likewise by 

 osmotic process. The portion of the network clothing the 

 stomachal and intestinal mucous membrane absorbs direct the 

 nutriments, and especially the emulsionized fats, which, during 

 digestion, give it a lacteous tint. 



The lymph is not borne on in an endless circuit like the blood. 

 In effect the whole system ends, in man, in two principal trunks, 



