OHAPTEE XXIV. 



Summary of the Argument on Abortion, 



As tlie result of Embryo Starvation from the Engoi-gement 

 and Relaxation of the Udder-Supply Arteries. 



The preceding argument in detail, with the evidences, 

 and illustrations, together making a sufficiently complete 

 demonstration, the following conclusions are connected 

 in a series of links, completing the chain of argument, in 

 preference to giving a summary of the chapters : — 



1. The extremely rapid and large increase in yield, by 

 aborting cows, necessitates an equally large and rapid pre- 

 vious increase in blood, and in the size of the arteries that 

 convey it to the udder. 



2. The engorgement and great expansion of the udder- 

 supply artery tubes with blood from rapid increase of feed, 

 being abrupt, the resulting over-strain of the artery-wall 

 tissues is equally abrupt and extreme ; the over-strain 

 causing relaxation by discohesion in the degree of the ex- 

 cessive strain from engorgement. 



3. Engorgement and its over-strain, thins down the ar- 

 tery walls in degree according to increase in their tubular 

 size, by over-rapid distension from too rapid increase of 

 blood, and its pressure. 



4. The engorging supply of blood to the milk-glands, 

 continuing to maintain yield, the large size at which the 

 udder-supply arteries are relaxed is maintained by main- 

 taining the large bulk of blood and yield ; thus keeping 

 the relaxed arteries as full and as much over-strained as 

 at the time of their relaxation. 



