cxxviii INDEX. 



309. Isothermal, isotheral, and isochimenal, p. 312326 Iso^eothermal, 



p. 208; Note 201. 



Littrow, Beschreibende Astronomic, Notes 37, 55. 

 Lord, on the snow-line on the two declivities of the Himalaya, Note 5. 

 Lottin, on auroras, p. 185, 187, ; Note 172. 



Lowenorn, discerned the corruscations of an aurora during bright sunshine, p. 182. 

 Lyell, successive variations of the general types of organic life, p. '264. Hypogene 



rocks, Note 241. Uniformity of inetamorphic action in different parts of the 



world, Note 259. 

 Lygian " field of stones," Note 61. 



Mackenzie, description of a great volcanic eruption in Iceland, p. 226. 



Maclear, parallax and distance of a Centauri, p. 144; Note 34. Increased 



brightness of i) Argus, p. 144 ; Note 120. 



Madler, compression of Uranus, p. 87. Distance of the innermost satellite of 

 Saturn from that planet, p. 89. Mass of the moon, p. 87 ; Note 40. Libration 

 of the moon, p. 90; Note 41. The three cold days of May (llth, 12th, 13th), 

 Note 86. Conjectures respecting the average mass of the double stars, p. 138 ; 

 Note 108. 



Magellanic clouds, p. 76 ; Note 33. 

 Magnetism, terrestrial, p. 167180 ; Notes 141170. Electro- and thermo-, p. 167, 



175-178; Notes 142, 163, 164, 167, 170. 



Magnetic attraction, p. 176 ; Note 162. Declination, p. 170 172; Notes 150-153. 

 Movement of closed systems of, Note ]52. Horary variations of, p. 171, 172 ; 

 Note 153. Equator, p. 172174; Notes 155-157. Inclination, p. 172-174; 

 Notes 154157. Intensity, p. 174, 175 ; Notes 158160. Lines, (see Lines). 

 Stations or observatories, p. 24, 178, 311 ; Note 166. Storms or disturbances, 

 p. 24, 167; Note 143 their connection with aurora, 179187; Notes 169, 170, 172. 

 Magnussen (Soemund), volcanic eruption in Scotland, p. 226. 

 Mahlmann, prevailing direction of the wind in the middle latitudes of the tempe- 

 rate zone in both continents, p. 312. 

 Mairan, described a jet of sparks in the zodiacal light, p. 131. Zodiacal light, 



Notes 91, 92, 95. 

 Malle (Dureau de la), noticed a remarkable passage of St. Fatricius on tin 



origin of thermal springs, Note 209. 

 Man, p. 350357 ; Notes 433-443. 

 Marbles, Parian and Carrara, p. 251 ; Notes 278280. 

 Margarita Philosophica of Gregorius Reisch, p. 44 ; Note 19. 

 Marius (Simon), first described the nebulae in Andromeda, p. 129. 

 Mars, see Planets. 



Martins, found the air on the Faulhorn to contain as much oxygen as the air at 

 Paris, p. 306. On polar bands of cloud, Note 174. On the distribution of the 

 annual fall of rain in the different seasons of the year, Note 405. 

 Maskelyne, Hutton, and Playfair, experiments on the deflection of the plumb-line 



by the attraction of SchehalHen, Note 138. 

 Matthieu, on the increased intensity of gravitation in volcanic islands shewn by 



pendulum experiments, Note 132. 



Matthiessen, letter to M. Arago on development of light and heat by electric 

 tension in finely divided matter of very small mass in proportion to its surface, 

 Note 98. 

 Mayer (Tobias), on the proper motion of the solar system, Notes 102, 105. 



