Q. PHYSIOLOGICAL H^EMATOLOGY. 

 By W. K. Jaques, Ph. M., M. D. 



INTRODUCTORY. 



The scientific world is constantly giving her discoveries 

 to the medical profession to be utilized in diagnosing dis- 

 ease and in providing means to relieve suffering. Each fact 

 thus obtained is a step nearer to the goal of positive medi- 

 cine and removes us farther from the past with its unsatis- 

 factory theories and dogmas. 



Blood, the most difficult tissue to study, has at last 

 begun to give up its secrets to the patient workers in phys- 

 iological and pathological laboratories. Although the facts 

 are few compared with the great labor it has taken to obtain 

 them, they are of such practical value that no practitioner 

 can afford to be without them. 



The discovery that toxins and antitoxins were con- 

 tained in the blood serum made possible the production of 

 diphtheritic antitoxin and gives us the serum diagnosis of 

 typhoid fever, beside opening a wide field of possibilities 

 for the future. 



The finding of the plasmodia.of malaria is often of the 

 greatest value in clearing up an obscure diagnosis. When 

 methods shall have been devised which will make their 

 detection less difficult, the discovery of the presence of 

 bacteria in the blood and the identification of the same will 

 be of great clinical importance. 



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