398 C. K. SWARTZ PROPOSED CLASSIFICATION OF CRYSTALS 



5. Certain inferences springing from the preceding discussion are con- 

 sidered. 



6. The advantages which are believed to be presented by this method of 

 development are briefly summarized. 



Part II contains a brief historical review of the development of the 

 modern classification of crystals and shows the relation of the author's 

 divisions to those of previous investigators. 



