iv Preface. 



and valuable methods of microscopical research been more 

 than outlined. The former will be found in numerous 

 text-books ; for the latter, it is expected that the stu- 

 dent will consult Whitman's " Methods of Microscopical 

 Anatomy and Embryology " and Lee's " Microtomists' 

 Vade-Mecum." 



PROVIDENCE, R.I., 

 March, 1892. 



