2 Veterinary Medicine. 



Special Pathology on the contrary is confined to a particular 

 disease and not only elucidates the causes, phenomena and results 

 of such disease, but seeks to do this in such a way as to differentiate 

 this malady from all others however closely related to it. Thus 

 inflammation of a bone is known under the general name of 

 osteitis, this may be due to a great variety of different causes, and 

 each would have its own special pathology. The osteitis of 

 simple mechanical injury is essentially different from the osteitis 

 of rheumatism, of purulent infection, of tuberculosis, of actino- 

 mycosis. So with the inflammations of every other tissue. Each 

 may suffer from a variety of inflammations, springing from dif- 

 ferent causes, attended with characteristically unlike tissue 

 changes and tending to different issues, and every one of these 

 forms has therefore its own special pathology. 



General Pathology may be said to deal with typical disease 

 processes to a large extent irrespective of the individual disease 

 in which they may appear, while Special Pathology deals with 

 the morbid phenomena which distinguishes the individual malady 

 from all other diseases however closely allied to it. 



Pathological (Morbid) Anatomy deals with structural 

 changes, the cause, the accompaniment or result of disease. 

 These morbid changes are microscopic or macroscopic. Both con- 

 stitute morbid anatomy, but the microscopic alterations come 

 under the special name of morbid (pathological) hi.stology. 



Pathological Chemistry is that branch of pathology which 

 treats of chemical changes produced by disease in the blood, 

 lymph, tissues, secretions and excretions. It demands a previous 

 knowledge of the condition of these tissues and fluids in health, 

 in the particular genus of animal and under the same dietary and 

 environment. Physiological Chemistry is therefore an essential 

 prerequisite to pathological chemistry, just as anatomy, physi- 

 ology and histology are indispensable to the appreciation of path- 

 ology and morbid anatomy. 



Disease is an injurious deviation from the normal function or 

 structure. The morbid process resulting in disease is usually in 

 the nature of a modification of the normal or phy.siogical condi- 

 tion, so that it is often difficult to set the exact limits of health 

 and disease. What is a purely physiological process under given 

 conditions, would be distinctly pathological under others. The 



