435 



Meteoric stones, i. 75, 109. 



Metre, French, on the length of, esti- 

 mated in parts of the English stand- 

 ard, ii. 85. 



Mexican Proteus, account of the or- 

 gans of generation of, ii. 221. 



Micrometer : single lens, description 

 of a, i. 456 ; made of rock crystal, 

 account of, ii. 141 ; on the method 

 of cutting rock crystal for, ii. 124. 



Microscope, periscopic, i. 438. 



: , on some properties in 



achromatic object-glasses applicable 

 to the improvement of the, ii. 399. 



Microscopic doublet, Dr. Wollaston's, 

 ii. 353. 



Migration of birds, observations on, ii. 

 204. 



Milk tusks of the dugong, on the, ii. 

 126. 



Milky Way, observations on the, i. 

 496. ii.77. 



Miller (Lt.-Col.), description of a per- 

 cussion shell to be fired horizontally 

 from a common gun, ii. 296. 



Mineral basin (South Wales), descrip- 

 tion of, i. 240. 



substances, on the modes of 



attraction which influence the for- 

 mation of, i. 135. 



Minerals, bitumen in, ii. 202. 



Mines in Cornwall, on the electro- 

 magnetic properties of metalliferous 

 veins in, ii. 412. 



Minium, native, discovery of, i. 232. 



Mists, on the formation of, ii. 110. 



Modulus of torsion, ii. 362. 



Moel Elio, the height of, ii. 132. 



Mole-cricket, anatomy of, ii. 236. 



Moll (Dr. G.), experiments on the ve- 

 locity of sound, made in Holland, ii. 

 221 ; on Capt. Parry's and Lieut. 

 Foster's experiments on the velocity 

 of sound, ii. 332. 



Monte dellaGuardia, on the manufac- 

 ture of sulphate of magnesia at, ii. 48. 



Moon, volcanic appearance in the, ii. 

 142 ; a luminous spot observed on 

 the dark part of her limb, ii. 167. 



Morgan (W.), method of determining 

 the values of contingent reversions 

 depending upon three lives, i. 4. 



Mornay (A. F.), account of the disco- 

 very of a mass of native iron in Bra- 

 zil, ii. 43 ; Dr. Wollaston's experi- 

 ments on, ii. 45. 



Morton (Earl of) on a singular fact in 

 natural history, ii. 137. 



Mother-of-pearl, optical properties pe- 

 culiar to, i. 502. 



Mount Vesuvius, on a saline substance 

 from, i. 474; on the eruptions of, ii. 

 339. 



Mountains in the North of England,on 

 the heights of, ii. 97. 



Mudge (Lt.-Col.), account of the trigo- 

 nometrical survey, made in 1797, 

 1798, and 1799, i. 33 ; account of 

 the measurement of an arc of the 

 meridian, from Dunnose, in the Isle 

 of Wight, to Clifton, in Yorkshire, i. 

 129; on the measurement of three 

 degrees of the meridian conducted in 

 England by, i. 435. 



Multinomials, on the expansion of 

 functions of, i. 390. 



Mummies, Egyptian, on, ii. 240; of 

 the Egyptian Ibis, i. 201 . 



Murdoch (W.) on the application of 

 gas from coal to economical pur- 

 poses, i. 294. 



Muriate of lime, artificial cold pro- 

 duced by, i. 40. 



of soda, analysis of, i. 356. 



Muriatic acid and oxymuriatic acid, on 

 their relation to each other, i. 377 ; 

 experiments on, i. 431. 



-, on decomposing, i. 14 ; 



oxygenized and hyperoxygenized, 



71 ; experiments on, i. 322. 

 Muscle (fresh-water), and oyster, mode 



of propagation of, ii. 301. 

 Muscles of slow-moving animals, on 



the, i. 7, 132. 



of fishes, on the, i. 210. 



oftheeye, on the uses of, ii. 190. 



Muscular motion, on, i. 163 ; on the 

 duration of muscular action, i. 348. 



Mushet (D.), experiments on wootz, i. 

 183. 



Musical intervals, temperamentof, i.l 0. 



Myxine and lamprey, on the respira- 

 tion of, ii. 23 ; on the mode of ge- 

 neration of, ii. 24. 



N. 



Naphthaline, on, ii. 146. 

 Narwhale, on the tusks of the, i. 458. 

 Natrolite, i. 39<i. 



Natural history, a singular fact in, 11. 

 137. 



