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WASHINGTON

OOVEKNMENT PRINTING OFFICE

278065

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CONTENTS.

Page.

Letter of transmitted 9

Prefatory note 11

K\ )»-i iii'.i-nix relative to the constitution of pectolite, pyrophyllite, calamine,

and analcite, by F. W. Clarke and George Steiger 13

The constitution of tourmaline, by K. W. Clarke 26

The colorimetric estimation of small amounts of chromium, with special

reference to the analysis of rocks and ores, by W. F. Hillebrand 37

Voliimrtric estimation of vanadium in presence of small amounts of chromium,

with special reference to the analysis of rocks and ores, by W. r. Hille-

brand 44

Distribution and quantitative occurrence of vanadium and molybdenum in

rocks of the United States, by W. F. Hillebrand 49

Warning against the use of fluoriferous hydrogen peroxide in estimating

titanium, by W. F. Hillebrand 56

Miueralogical notes, by W. F. Hillebrand 57

1. Calaverite from Cripple Creek, Colorado 57

2. Tellurides from California 60

3. Hessite from Mexico 63

4. Covellite and enargite from Montana 63

5. Tysonite and bastniisite 64

6. Prosopite 66

7. .Teftersonite 68

8. Anorthite and epidote 69

9. Roscoelite 70

10. Mariposite 74

11. Two sulphates from Montana 75

On the chloronitrides of phosphorus and the metaphosphimic acids, by H. N.

Stokes 77

1. On tri- and tetraphosphonitrilic chlorides 77

2. On trimetaphosphimic acid and its decomposition products 89

3. On tetrametapbosphiniic acid 116

4. The higher chloronitrides 124

5. The higher metaphosphi mic acids 136

On a hydromica from New Jersey, by F. W. Clarke and N. H. Darton 154

The alkaline reaction of some natural silicates, by F. W. Clarke 156

The solubility in water of certain natural silicates, by George Steige.r 159

Index 161

5

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