2C4 LYMPHANGITIS. 



the production of this disturbance, all may be grouped as — 

 1. Intrinsic, or those more properly belonging to the animal 

 itself, comprehending such as are spoken of as remote or pre- 

 disposing, connected with speciality of individual temperament, 

 form, and organization — generally inherited. 2. Extrinsic, those 

 more truly operating from without, comprehending (a) the 

 reception by the system of nutritive material in excess of the 

 natural waste or requirements and powers of disposal ; 

 (h) disturbance of the balance which ought at all times to 

 exist amongst the different phenomena of the living body, 

 particularly those of food-assimilation, secretion and excretion, 

 Avhether this disturbance is brought about by the infringement 

 of hygienic laws, or by the action of adverse operating agencies 

 over which we may have little or no control. 



1. Intrinsic Causes. — The hereditary or inherent tendency 

 of certain horses, under very trifling or even no apparent cause, 

 to contract this disease is a fact tolerably well known to all 

 who have paid any attention to the subject ; while there is 

 little doubt that it is simply because this and other cognate 

 matters associated with the physiology of breeding have not 

 been known, or if known, systematically ignored as to the 

 practical inferences to be drawn from the knowledge, that we 

 find distributed over the country so many constitutionally 

 faulty and unsound animals. Amongst the agricultural and 

 heavier breeds of horses, which are the great sufferers from 

 lymphangitis, there are various modifications of type. Some 

 there are with large, it may be, but compact and well-knit 

 muscular bodies, supported upon limbs well-placed in relation to 

 their bodies ; and although their legs, below the knee and 

 hock, may be well clothed with hair, it is found that this hair 

 is rather long and soft than remarkable for thickness, that 

 these limbs in the metacarpal and metatarsal regions feel, on 

 being handled, clean and hard, the flexor tendons and great 

 suspensory ligament distinctly prominent, there being no filling 

 up of the spaces between bone and ligament, and ligament and 

 tendon, with soft, pulpy connective-tissue, the entire leg in this 

 region below the knee and hock having the appearance of 

 great breadth. 



Others, again, seem the opposite of all this : their bodies may 

 be bulky or of small size ; they invariably, however, give to the 



