Vhc ;ul\aiucs inadc chii'inL; the last few years, 

 which 1 )()ct()r l-isclicr has so well siiiiiniarizcd, 

 ha\ c been i\'iulcrccl possible |)i"iniaril\ b\ the iso- 

 lation of pure strains of cells and 1)\ the de\elop- 

 nient of procedures for measuring' the rate of <;Tow'th 

 and for stud\ ini; the fimctional aeti\it\' of the tissues. 

 The use of pui^e strains of cells instead of h'ai^incnts 

 of fresh tissues has been of fundamental importance, 

 and Doctor Fischer has contributed to this progress 

 1)\' obtainini^' the first permanent strain of epithelial 

 cells. Although the technical improvements realized 

 recenth ha\'e been consideral)lc, the method is still 

 in its infancy. There is need of main' experimenters 

 in this field. The book by l^octor I'isclicr will be 

 of particular value to those who desire to use the 

 modern techniques in tissue culture, and will con- 

 tribute markedl)' to the progression of an important 

 method of investigation. 



New York, February 6, igsj. 



^ I lexis Cancel. 



