Pathology

{path-ol’ -o-je) [rrddog, disease;?ioyog, science]. The branch of medical science that treats of the modifications of function and changes in structure caused by disease. P., Cellular, pathology that makes the cell the basis of all vital phenomena, and teaches that every cell is derived from a preexisting parent-cell. P., Comparative, a study of pathologic proce es in lower animals, for purposes of tracing resemblances and differences among them and between them and those of the human body. P., Experimental, the study of pathologic proce es artificially induced in lower animals. P., General, that department of pathology which takes cognizance of those morbid proce es that may be observed in various diseases and in any organ, e. g., inflammation, hypertrophy. P., Geographic, pathology in its relation to climatic and geographic conditions. P., Humoral, the old doctrine that disease is due to abnormal conditions of the blood. It has been revived in recent times in a modified form, and is now based on the theory that both immunity and susceptibility to disease reside in the juices of the body. P., Special, that treating of changes in function and structure occurring in special organs, e. g., pneumonia. P., Surgical, the pathology of diseases treated by the surgeon. 482