162 
INDEX. 
Pajje. 
Chlorides, paper on tri-and tetraphospkoni- 
trilic 77-89 
Chloride, heptaphosphonitrilie, constitu- 
tion, molecular weight, and prop- 
erties of 133 
melting and boiling points of 125 
Chloride, hexaphospiionitrilie, constitution, 
molecular weight, and properties 
of 132-133 
tigure showing crystal of 132 
melting and boiling points of 125 
Chloride, nitrilo-hexaphosphonitrilic^analy- 
sis of 135 
observations on 135-136 
Chloride, pentaphosphonitrilic, constitu- 
tion, molecular weight, and proper- 
ties of 131 
melting arid boiling points of 125 
Chloride, phosphonitrilic, analysis of 89 
methods of analysis of 130 
method of preparing 125,127-130 
properties of 126-127 
saponification of 141-142 
Chloride, polyphosphonitrilic, analysis of. . 134 
melting and boiling points of 125 
observations on 134, 135 
Chlorides, residual oily phosphonitrilic, 
analysis of ., 133 
molecular weight and properties of 134 
Chloride, tetraphosphonitrilic, action of 
water on 88 
composition, vapor density, and char- 
acter of 86-88 
melting and boiling points of 125 
Chloride, triphosphonitrilic, action of water 
on 83-84 
general observations on 82-83 
melting and boiling points of 125 
Chloride, tri- and tetraphosphonitrilic, 
method of analysis of 82 
preparation of 79-82 
Chloronitrides of phosphorus and metaphos- 
phimic acids, paper on 77-153 
Chlorophosphuret of nitrogen, discovery of. 77 
Chromium, colorimetrie estimation of small 
amounts of 37-43 
volumetricestimationof vanadiumin the 
presence of small amounts of 44-48 
Claasen, E., cited on method of determining 
presence of vanadium 53 
Clarke, F. W., letter of transmittal by 9 
notes on chemical constitution of ros- 
coelite by 73-74 
paper ou the alkaline reaction of some 
natural silicates by 156-1 58 
paper on the constitution of tourmaline 
by 26-36 
prefatory note by 11 
reference to 13, 15, 68, 76, 160 
Clarke, F. "W., and Darton, N. H., paper on a 
hydromica from New Jersey by 154-155 
Clarke, F. W., and Steiger, G., report on ex- 
periments relative to the constitu- 
tion of pectolite, pyrophyllite, cala- 
mine, and analcite by 13-25 
Page. 
Coloradoite from Norwegian mine, Cal., 
niineralogical notes on 62-63 
Colorimetrie estimation of small amounts of 
chromium 37-43 
Couldridge, W., cited on composition of 
phospham 86 
cited on triphosphonitrilic chloride 80 
cited on zinc ethyl 83 
reference to 78 
Covellite, Butte, Mont., analyses of 64 
Cupric imidodiphosphates, observations on 115 
Dana, E. S., mentioned 24 
Darton, N. H., and Clarke, F. W., paper on 
a hydromica from New Jersey by. 154-155 
Diabase, Mount Ascutney, Vt., percentage 
of silica and vanadium in 50 
Di-ammonium tetrametaphosphimate, ob- 
servations on and analyses of 122 
Diimidotriphosphoric acid, constitution of. 94,95 
observations on salts of ] 10-113 
Diller, J. S., aid by 70 
Dimetaphosphimic acid, observations on . . . 139 
Diorite, Butte and Plumas counties, CaL, 
percentage of silica and vanadium in 50 
Cecil County, Md., percentage of silica 
and vanadium in 50 
Douglas Island, Alaska, percentage of 
silica and vanadium in 50 
La Plata County, Colo., percentage of 
silica and A-anadium in 50 
Mitchell County, N. C, percentage of 
silica and vanadium in 50 
Diorite-porpbyry, La Plata Mountains, 
Colo., percentage of silica and va- 
nadium in 50 
Di potassium tetrametaphosphimate, obser- 
vations on, and analysis of 120 
Doelter, C, cited on formula for analcite. . . 20 
Dunnington, F. P., cited on estimation of 
titanium 56 
Elseolite, from Litchfield, Me., solubility of 
and percentage of alkalies in 159 
Enargite, Butte, Mont., analysis of .... 64 
Euglish, G. L., specimen collected by 68 
Epidote, Phippsburg, Me., analysis of 70 
niineralogical notes on anorthite and. . . 69-70 
Ethyl, zinc. See Zinc ethyl. 
Ferric imidodiphosphate, observations on. . 115 
Ferric trimetaphosphimates, observations 
on 107-108 
Fischer, T., cited on method of quantitative 
analysis 37 
Fluoriferous hydrogen peroxide, warning 
against use of, in estimating titan- 
ium 5(5 
Foote, H. W.,and Penfield, S. L. See Pen- 
field, S. L., and Foote, H. W. 
Formula, requirements of 2' 
Friedel, G., cited on replacement of water 
of zeolites 2! 
cited on water in analcite 2: 
Gabbro, Adirondack region, N. Y., percent- 
age of silica and vanadium in 5 
Douglas Island, Alaska, percentage of 
silica and vanadium in 5 
