INDEX. 
423 
L. 
Limestone nodules, on the structure of certain, 149. 
M. 
Macdonald (J. D). On the Anatomy of Nautilus umbilicatus, compared with that of Nautilus 
Pompilius, 277. 
Remarks on the Anatomy of Macgillivrayia pelagica and Cheletropis Huxleyi (Forbes) ; 
suggesting the establishment of a new Order of Gasteropoda, 289. 
Further observations on the Anatomy of Macgillivrayia, Cheletropis, and allied genera of 
pelagic Gasteropoda, 295. 
Macgillivrayia pelagica, anatomy of, 289, 295. 
Madder, 389 (see Schunck). 
Magnet, on the nature of the force by which bodies are repelled from the poles of a, 1 (see Tyn- 
dall). 
Megatherium, Professor Owen on the, 359. 
Muscular fibre, on the development of striated, in Mammalia, 243. 
N. 
Nautilus umbilicatus, anatomy of, compared with that of Nautilus Pompilius, 277. 
Nile, deposit of the (see Horner). 
O. 
Organo-metallic bodies, researches on, 257 (see Frankland). 
Owen (R.). On the Megatherium {Megatherium Americanum, Cuvier and Blumenbach). Part 11. 
Vertebrae of the trunk, 359. — Of the spinal column, 368; comparison of the vertebral 
column, 381. 
P. 
Planetary theory, differential equations of the, 330. 
Polarity, diamagnetic, 33 (see Tyndall). 
Pratt (Archdeacon J. H.). On the Attraction of the Himalaya Mountains, and of the elevated 
Regions beyond them, upon the Plumb-line in India, 53. — Dissection of the attracting 
mass, 64; approximation to the amount of attraction, 71 ; numerical results, 85; excess of 
calculated results accounted for, 95. 
R. 
Resistance of flexure in beams, 225 (see Barlow). 
Respiratory movements of insects, on the, 139 (see Barlow). 
Rubian, rubianic acid, &c., 389 (see Schunck). 
Russell (W. H. L.). On the Theory of Definite Integrals, 157. 
MDCCCLV. 3 L 
