•THEAlCfl<iSCOpE' 



:ated 



Vol. XI. 



TRENTON, N. J., MARCH, 1891. 



No. 3. 



ORlGIIiAL 

 Co/VAVNICATIonS 



CYTOLOGY OR CELLULAR BIOLOGY.— III. 



DISCOVEKY OF THE CELL AND ITS CONSTITUENT PARTS. ELEMEN- 

 TARY ORGANISMS. THE CELLULAR THEORY. 



REV A. M. KIKSCH, C. S. C, PROFESSOR OF BIOLOGY, UNIVERSITY 

 OF NOTRE DAME. 



IN all scientific investigations it is necessary first to know 

 what has already been done in the department in the past ; 

 in other words, one must be familiar with the bibliography of 

 the subject under consideration. An investigator that does not 

 observe this rule will often lose much valuable time in going 

 over the same ground that another has already explored. It is 

 not my object at present to publish original observations and 

 investigations in Cytology, for I fear that many of my readers 

 are not yet acquainted with this line of investigation. The 

 reader will therefore kindly excuse me for presuming to take 

 upon myself the office of a cicerone. 



As far as I know, there exists only one text-book of Cytology, 

 that by Canon J. B. Carnoy, Professor of Cytology in the Uni- 

 versity of Louvain ; even this is not yet completed. Professor 

 Carnoy, therefore, must serve as a guide to introduce my readers 

 to a knowledge of the subject. I deem it also necessary to ac- 



