CX NOTES. 



( 416 ) p. 335. Arago, in the Annuaire du Bureau des Longitude! pjur 

 1838, p. 246. 



( 41 7) p. 335. Arago, p. 249 266 of the above-named volume. Compare 

 p. 268279. 



( 418 ) p. 336. Arago, p. 388 391 of the same volume. Von Baer, who has 

 rendered such great services to the meteorology of the north of Asia, has not 

 discussed the rare occurrence of thunderstorms in Iceland and Greenland ; he 

 has only noticed that thunder has sometimes been heard in Nova Zembla and 

 Spitzbergen. (Bulletin de 1'Acad. de St.-Petersbourg, 1839, Mai). 



( 4W ) p. 337. Kamtz, in Schumacher's Jarhbuch fur 1838, S. 285. On 

 the comparison of the laws of the distribution of heat to the East and to the 

 West, in Europe and North America, see Dove's Repertorium der Physik, 

 13d. iii. S. 392395. 



( 42 ) p. 339. The " natural history of plants," which has been ably and 

 briefly sketched by Endlicher and Unger (Grundziige Botanik, der 1843, 

 S. 449 468), was distinguished by myself from the " geography of plants" 

 more than half a century ago, in a passage of the aphorisms appended to 

 my Subterranean Flora : " Geognosia naturam animantem et inanimam 

 vel, ut vocabulo minus apto, ex antiquitate saltern haud petito, utar, cor- 

 pora organica seque ac inorganica cousiderat. Sunt eiiim tria quibus absol- 

 vitur capita: Geographia oryctologica quam simpliciter Geognosiam vel 

 Geologiam dicunt, virque acutissimus AVernerus egregie digessit ; Geographia 

 zoologica, cujus doctrinse fundameuta Zimmermannus et Treviranus jecerunt ; 

 et Geographia plantarum quam sequales nostri diu intactam reliquerunt, 

 Geographia plantarum viucula et cognationem tradit, quibus omnia vegetabilia 

 inter se connexa sint, terrse tractus quos teneant, in serein atmosphsericum 

 qua? sit eorum vis ostendit, saxa atque rupes quibus potissimum algarum pri- 

 mordiis radicibusque destruantur docet, et quo pacto in telluris superficie 

 humus nascatur, commemorat. Est itaque quod differat inter Geognosiam et 

 Physiographiam, historia naturalis perperam nuncupatam, quum Zoognosia, 

 Phytognosia et Oryctognosia, quee quidem omnes in naturaj investigatione 

 rersantur, non nisi singulorum animalium, plantarum, rerum metallicarum 

 rel (venia sit verbo) fossilium formas, anatomen, vires scrutantur. Histori 

 Telluris, Geoguosiae magis quam Physiographic affinis, nemini adhuc tentata, 

 plantarum animaliumque genera orbem inhabitantia primsevum, migratioacs 

 eorum coinpluriumque interitum, ortum quern montes, valles, saxorum st rata 

 et venae metalliferee ducuut, serem, mutatis temporum vieibus, modo purum, 

 inodo vitiatum, terrse superficiem liumo plautisque paulatim obtectam, flumi- 



