730 INDEX. 
curial with the Air Thermometer, 581. VI. 
Compression, 586, 
Minding’s System of Forces. By Professor CHRYSTAL, 
519. See Curystat (Professor), 
Minding’s Theorem. By Professor Tarr. Proved by 
Quaternion Methods, 675. See Tarr (Professor). 
Mineralogy of Scotland. Chapter V.—The Micas with 
Description of Haughtonite, 1-46. Chapter VI. 
—Chloritic Minerals, 55-80. The Saponites, 
81-111. Bhreckite, 111. Rubislite, 112. 
Haughtonite, a new Mineral Species. By 
Professor Huppin, 21. Its Occurrence, 21-43. 
Analyses of, 32, 34, 35, 37. Scottish Haughto- 
nite, 35. Foreign Haughtonite, 35. In every 
case where it occurs in Exfiltration Veins Oli- 
goclase is also present, 38. Biaxial, 23, 28, 
42, Orthorhombic in Form, 42. Its Crystals 
disposed in Lengthened, Radiating, fan-shaped 
Arrangements, 42. Action of Fluxes, the 
Blowpipe, and Acids on, 42. 
Murr (Tomas), M.A., F.R.S.E. General Theorems 
on Determinants, 47. Case where the two sets 
of rows, instead of being contiguous, overlap 
each other, 47. II. Reduction of the Order of 
a Determinant, 51. III. Product of a Deter- 
minant and a Polynomial, 53. 
Muscovite. A Mica of Scotland, 1. Analysis of, 1. 
Finest Specimens found in Shetland and Ross- 
shire, 2. Axis in Plane of longer Diagonal, 2. 
See Hepp (Professor). 
N 
Nicou (W. W. J.), M.A., F.R.S.E. On the Action of 
Sulphide of Potassium upon Chloroform, 531. 
12 
Paleoniscus or Benedenius. A genus of the Platy- 
somide, 354. 
Penninite, Analysis and Specific Gravity of, 64. 
Petrography of the Basin of the Firth of Forth, 487. 
Phlogopite, 14. 
Physiological Actions of Drugs on the Secretion of 
Bile. See Rutuerrorp (Professor WILLIAM), 
M.D., 133. 
Physiological Results of Temperature Variations. 
See Haycrart (Jonn Berry), M.B., 119. 
Pihlite. A Mica of Scotland, 45. Analysis of, 
46. Action of Blowpipe on, 46. See HEppLE 
(Professor). 
Platysomide. On the Structure and Affinities of 
Platysomide. By Ramsay H. Traquair, M.D., 
F.R.S.E. Genus I. Eurynotus, 348. Genus II. 
Benedenius, 354. Genus III. Mesolepis, 355. 
Genus IV. Eurysomus, 358. Genus V. 
Wardichthys, 361. Genus VI. Cheirodus, 
363. Genus VII. Platysomus, 368. Affini- 
ties of the Platysomide, 379. Relationship 
to the Dapediide, 380.  Jelationship to 
the Pycnodontide, 382. Lepidopleuride, a 
proposed Suborder, 384. Affinities with the 
Paleoniscide, 386. 
Platysomus. A genus of Platysomide, described, 348, 
368. 
Prayrair (P. M.) and MacrarLaNg (ALEXANDER), 
D.Sc., F.R.S.E. On the Disruptive Discharge 
of Electricity, 561. 
Plectrolepis. A genus of Platysomide, 348. 
Porphyrites of the Basin of the Firth of Forth, 508. 
Position. Note on a Theorem in Geometry of Posi- 
tion, 657. See Tarr (Professor). 
Potassium (Sulphide of). Its Action upon Chloro- 
form. By W. W. J. Nicol, M.A., 53]. 
Pseudophite, a variety of Penninite. Analysis of, 
64. Almost identical with Pyrosclerite, 64. 
Pyrosclerite almost identical with Pseudophite. 
R 
Ripidolite, Analysis of, 65, 66. 
Ropinson (G. Carr), F.R.S.E., and Goopwin (W. 
L.). {On some New Bases of the Leucoline 
Series, Part IL, 265, 273. 
Rock Thermometers at the Royal Observatory, Edin- 
burgh, 637. See Smyru (Professor Prazzi), 
Astronomer-Royal for Scotland. 
Roots of an Equation, their Relation to its Coefti- 
cients. See Dioxson (J. Dovenas Hamitton), 
M.A., 535. 
Rubislite, a New Mineral. Analysis and Specitie 
Gravity of, 113. 
RuruHerFrorD (Professor Wiiu1amM), M.D., F.R.S.E. 
On the Physiological Action of Drugs on the 
Secretion of Bile. Introduction, 133. Methods 
of Experiment adopted by Nasse, Kolliker, 
Miller, Scott, and by Professors Hughes, 
Bennett, Gamgee, and the Author in 1866, 136 ; 
and by Réhrig in 1873, 136, 139. Method of 
Experiment now adopted by the Author, 137. 
Secretion of Bile in a Curarised Fasting Dog, 
141. Composition of Bile in a Fasting Dog, 
143, Secretion of Bile per Kilogramme of 
Body-weight in a Fasting Dog, 143. Action 
of Croton-Oil, 145. Action of Podophyllin, 
147. Action of Aloes, 154. Action of Rhu- 
barb, 157. Action of Senna, 160, Action of 
Colchicum, 161. Action of Magnesium Sul- 
phate, 164. Action of Castor-Oil, 165. Action 
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