314 



SCIENCE 



[N. S. Vol. XXXII. No. 818 



TABLE n 



Mineral Analyses. (All material air-dried.) 



1. Orthoclase. Small light brown tufts (re- 

 sembling stilbite in form) lining amygdaloidal 

 cavities. T. 39 N., R. 21 W. Analysis by F. F. 

 Grout. 



2. Albite. Separated by specific gravity from 

 an albite-epidote rock. T. 126 N., R. 35 W. 

 Analysis by F. F. Grout. 



3. Anorthite. Beaver Bay, north shore of Lake 

 Superior. Analysis by C. P. Berkey. 



4. Soda-microcline phenocrysts in red granite. 

 T. 123 N., R. 29 W. Analysis by L. Pease and 

 F. H. Keller. 



5. Analcite. Trapezonedral crystals (211), 

 colorless to red in amygdaloidal cavities. T. 39 N., 

 R. 21 W. Analysis by F. F. Grout. 



6. Datolite. New occurrence for Minnesota ex- 

 cept in glacial drift. Enamel-like bunches oc- 

 curring like No. 1 and No. 5 above. T. 39 N., 

 R. 21 W. Analysis by F. F. Grout. A rough 

 determination of boric acid gave 17.36. 



7. Laumontite. Light pink amygdules. T. 39 N., 

 R. 21 W. Analysis by F. F. Grout. 



8. Laumontite. Dark red vein filling. T. 39 N., 

 R. 21 W. Analysis by F. F. Grout. 



9. Pseudomorph after No. 8, especially near 

 calcite contacts. Analysis by F. F. Grout. 



10. A further alteration of No. 8, to white 

 soapy earth with loss of the original form and 

 structure. Analysis by F. F. Grout. Average of 

 four analyses with uniformly low summation. 



11. An earthy product resembling No. 10 oc- 

 curring with chlorite No. 12 on Upper Tamarack 

 Creek. T. 42 N., R. 16 W. Analysis by F. F. 

 Grout. 



12. Chlorite from the same rock as No. 11. 

 Analysis by F. F. Grout. 



13. Chlorite amygdules. T. 39 N., R. 21 W. 

 Analysis by F. F. Grout. 



14. Chlorite (or green earth) vein. T. 42 N., 

 R. 18 W. Analysis by F. F. Grout. 



The high hygroscopic moisture is recovered on 

 standing in ordinary air. 



