INDEX. 
619 
M. 
Magnetic curve , to find the multiple points, and the directions of their tangents, of the, 92. 
to trace it, and determine the nature of its branches and singular points, 85. 
Magnetic experiments tried on board an iron steam-vessel, report of, &c., 267. 
Magnetic force, centres of ; if two be situated within the earth, there will be two and only two on 
its surface, at which the needle can take a position vertical to the horizon, 105. 
Magnetic needle, Captain Back’s observations on the dip and variation of, compared with theo- 
retical results, 387. 
observations on the dip of, made during Captain Back’s expedition at Fort 
Reliance and other stations, 378 et seq. 
- observations on the variation of, at different stations, made by Captain Back, 
387 ; and table of the same, 390. 
on the points at which it takes a position vertical to the surface of the earth, 83. 
Magnetic verticity, on the curve of, 95. 
Magnetical observations made by Captain Back, 11. N. during his late arctic expedition, discus- 
sion of, 377. 
N. 
Negro, brain of, has not more resemblance to the brain of the Orang-Outang, except in the 
greater symmetry of the gyri and sulci, than that of the European, 519. 
cerebellum of, 513. 
intellectual faculties of, remarks on, 520. 
nerves on the basis of his brain, not thicker than those of the European, 518. 
on the brain of, compared with that of the European and the Orang-Outang, 497. 
spinal cord and medulla oblongata of, 512. 
Newport (George, Esq.). On the respiration of insects, 529. 
P. 
Philip (A. P. W., M.D.), On the powers on which the functions of life in the more perfect ani- 
mals depend, and on the manner in which they are associated in the production of their more 
complicated results, 343. 
Plants, on the influence of light on, 150. 
on their action on the atmosphere, 163. 
Powell (Rev. Baden). Researches towards establishing a theory of the dispersion of light, 
No. II., 17. 
S. 
Schumacher (Professor). A comparison of the late imperial standard troy pound weight with a 
platina copy of the same, and with other standards of authority, 457. 
Shell, on an artificial substance resembling it, 49. 
Shulls, on the size and capacity of the cavity of, 504. 
Solly (Samuel, Esq.). On the connexion of the anterior columns of the spinal cord with the 
cerebellum, 567. 
Spinal cord, on the connexion of the anterior columns of, with the cerebellum, 567. 
Springs of the Pyrenees : — Eaux Chaudes, 584 ; Eaux Bonnes, 585 ; Cauteretz, 5S6 ; St. Sau- 
veur, 589 ; Bareges, 591; Bagneres de Bigorre, 592; Caudiac, 594; Bagneres de Luchon, 
594; Lez, 595; Aulus, 596; Ussat, 597; Ax, ibid . ; Las Escaldas, 600; Dorres, 601; 
Thuez, 602; Vernet, 604; Bains pres d’ Arles, 605. 
of other parts of Europe : Baths of Mont d’Or, 607 ; Bourboule des Bains, 60S ; Baden- 
