172 THE ACTION OF THE LIVING CELL 



was then estimated by measuring the size of the 

 wound and area of granulation from day to day. With- 

 out exception it was found that the wound healed much 

 more rapidly in the immunized than in the non- 

 immunized cats. These results are summarized in 

 Table XII. (Turck, 1921.) 



TABLE XII 

 Rate of Wound Healing in Immunized Cats (Turck, 1921) 



The figures given above represent the average measurements in centimeters 

 of the unhealed portions of the standardized wounds (3X3X4 cm.) in three 

 different groups of cats. The first group were untreated in any way. The 

 members of the second group received injections of a few drops of cytost around 

 the margin of the wounds, while all members of the third group had been 

 actively immunized to cytost as described in the text. 



These results indicate that the immunized animals 

 can more readily cope with minor injuries than can 

 the non-immunized. Since all animals during their 

 existence are subjected to various minor injuries of 

 one sort or another, it follows that an increased tol- 

 erance to cytost must be of considerable service to 

 the animal in overcoming adverse disturbances in his 

 environment. 



It has long been recognized that, other things being 

 equal, the rate of healing of a localized injury is in a 

 large measure determined by systemic conditions of 

 a so-called "constitutional" nature. While the term 

 constitutional is admittedly vague, it nevertheless 



