530 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 59. 



COMBINATIONS. 



Below are listed the combinations recorded for 55 of the crystals 

 measured, including all of those which showed new or rare forms. 

 The greatest number of forms recorded for any crystal is 35, while 

 the least number given below is 5. The latter crystal was, however, 

 very incompletely developed, and many of the others which showed 

 fewest forms would have shown others had the crystal not been 

 badly broken or much crowded during growth. Some of the crystals 

 listed below were incompletely measured. 



Combinations observed on datolite from Westfield. 



