LECTURE VI. 



MARCH 3, 1858. 



NUTRITION AND CIRCULATION. 



Arteries Capillaries Continuity of their membrane Its porosity Haemorrhage 



by transudation (per diapedesin) Veins Vessels during pregnancy. 

 Properties of the walls of vessels : 



1. Contractility Rhythmical movement Active or irritative hypersemia 



Ischaemia Counter irritants. 



2. Elasticity and its importance as regards the rapidity and uniformity of the 



current of blood Dilatation of the vessels. 



3. Permeability Diffusion Specific affinities Relations between the supply 



of blood and nutrition Glandular secretion (liver) Specific action of the 

 elements of the tissues. 



Dyscrasia Its transitory character and local origin Dyscrasia of drunkards 

 Hasmorrhagio diathesis Syphilis. 



I HAVE endeavoured, gentlemen, in the last two lectures, 

 to present to you a somewhat detailed picture of the 

 more delicate arrangements which prevail in the body 

 for the conveyance of the different currents of nutritive 

 juices, and particularly for the conveyance of those cur- 

 rents in which the juices themselves are more hidden 

 from observation. Allow me to-day to pass on to the 

 consideration of the larger channels and nobler juices, 

 which, according to prevailing opinion, stand more in the 

 foreground. 



The distribution of the blood takes place, as is well 

 known, within the vessels in the following manner : The 

 arteries divide into finer and finer branches, and whilst 



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