INDEX. 
661 
M. 
M'Kichan (D.). Determination of the Number of Electrostatic Units in the Electromagnetic Unit 
made in the Physical Laboratory of Glasgow University, 409. 
Magnetic Survey of Belgium in 1871, 341. 
Magnetical observations in tubular iron bridges, 331. 
Mallet (R.). Volcanic Energy : an attempt to develop its true Origin and Cosmical Relations, 147. — 
Heat developed by the crushing of rocks, 180 ; contraction of slags &c. in cooling, 191 ; appendix, 
thermal springs, 222 ; heat and work from quartz-crushing, 223. 
Metals, bright lines in spectra of, 266. 
Montebrasite, 582. 
Moon, radiation of heat from the, 587. 
Muscles, minute structure of, in the water-beetle, 429. 
0. 
Orthogonal surfaces, 229. 
P. 
Paridigitata, 41 (see Kowalevsky). 
Parker (W. K.). The Bakerian Lecture. — On the Structure and Development of the Skull in the 
Salmon, 95. — Introduction, 95 ; eighth stage, adult skull, 98; first stage, embryos, 112; second, 
unhatched, 120 ; third, still unhatched, 122 ; fourth, newly hatched, 125 ; fifth, fry of second week, 
127; sixth stage, sixth week, 135; seventh, of first summer, 137 ; explanation of plates, 142. 
Pengelly (W.). Report on the Structure and Contents of Brixham Cave, 483. 
Perry (S. J.). Magnetic Survey of Belgium in 1871, 341. 
Prestwich (J.). Report on the Exploration of Brixham Cave, conducted by a Committee of the 
Geological Society, and under the superintendence of W m. Pengelly, Esq., aided by a local Com- 
mittee ; with Descriptions of the Animal Remains by George Busk, Esq., and of the Flint Imple- 
ments by John Evans, Esq., 471 (for contents see p. 471). 
R. 
Rosse (Earl of). The Bakerian Lecture. — On the Radiation of Heat from the Moon, the Law of 
its Absorption by our Atmosphere, and its Variation in Amount with her Phases, 587. — Deter- 
mination of the law of extinction of the moon’s radiant heat in our atmosphere, 592 ; comparison 
of the reducing curve in zenith-distance with Laplace’s law, 616; simultaneous observations of the 
moon’s heat and light during the eclipse of November 14th, 1872, 619 ; comparison with Zollner’s 
results, 620; moon’s heat compared with that from a terrestrial source, 621 ; appendix, 624. 
S. 
Salmon, development of the skull in the, 95. 
Schafer (A.). On the Minute Structure of the Leg-muscles of the Water-beetle, 429. 
Skull, development of, in Salmon, 95. 
Spectra of sun and stars, 253, 652, 655 ; of metals, 266; of metallic compounds, 641 ; of metalloids, 652 ; 
of alloys, 654. 
Standards of length, comparison of national, 445 ; table of results, 469. 
Sun, spectrum of the, 253, 639. 
