J. F. Kemp — Basic Dike near Hamburg, N. J. 



303 



titanite crystals are grouped about the rims in great numbers. 

 Dr. Hussak also mentions tiny muscovite scales as probably 



Fig:. 3. 



Fig. 3. Micro-drawing of a spheroid. Lettering as in fig. 2. In addition C is 

 calcite, F is feldspar. Actual field 3 5 mm , 



present in the one examined by him. Around more than half 

 the spheroid are flakes of biotite arranged tangential ly, but 

 neither in this nor in others do they entirely surround the 

 kernel, which shades out into the general groundmass. The 

 spheroids so far as observed are always rounded and show no 

 recognizable outlines of the tetragonal trisoctahedron. They 

 gelatinize readily and stain a deep tint with fuchsine. An 

 analysis of several by Professor L. M. Dennis, of Cornell Uni- 

 versity yielded the results in column 1. The water was deter- 

 mined by direct weight. Column II, contains the same analy- 

 sis, recalculated after the C0 2 of I, had been combined with the 

 necessary CaO, to afford CaC0 3 , and omitted. This reduces 

 the analysis to a nearer expression of the analcite present. 



I. II. III. iv. v. VI. VII. VIII. 



H 2 



6-08 



6-31 



1-46 



1-78 



8-11 



5-01 



0-52 



0-95 



Si0 2 



50-52 



52-44 



55-91 



55-06 



54-34 



55-28 



56-48 



44-46 



Al.O, 



25-477 



26-44 



23-88 \ 



-25.26 



23-61 



21-21 



23-14 



30-97 



Fe 2 3 



0-413 



0-43 



3-12 



0-12 



0-93 







2-09 



CaO 



4-05 



1-94 



1-22 



0-60 



0-21 



3-70 







0-66 



MgO 









tr. 



0-28 





0-39 











K„0 



3-41 



3-54 



6-09 



10-34 



0-66 



2-73 



19-78 



5-91 



Na 2 



8-58 



8-90 



9-55 



7-60 



12-95 



8-93 



0-50 



15-61 



co 2 



1-71 































Total 



100-240 



100 00 



101-23 



100-92 



100-00 



98-18 



100-42 



100-65 



