146 Linnaan Society. 



white on the belly of the Gazelles. This does not agree with our ani- 

 mal, which is white in several parts, but certainly not so white as the 

 Gazelle, and has black on the legs ; but as yet no other animal has 

 been brought from West Africa, which better agrees with their account 

 or figure. 



M. Sundevall considers specimens of the Naff or of Senegal and the 

 Bohor of Abyssinia, in the Frankfort Museum, as distinct, the former 

 having the hair of the back whorled, the fore-leg with a dark stripe, 

 and the latter having the hair not whorled and the legs pale. Our 

 specimens, from Gambia, have the hair not whorled, and more or less 

 distinct streaks on the fore-legs ; hence I am inclined to believe the 

 Nagor and the Bohor to be alike. Sundevall' s animal may be the 

 Kob, but that has only one whorl on each end of the back, a nearly 

 cervine muffle, and the end of the tail black. 



When in Frankfort, I observed that the male Antilope Bohor, from 

 Abyssinia, was rather larger than the male of " A. redunca," from 

 Senegal, in the same collection, and much brighter, and the horns 

 more slender ; the female was darker and browner than the male ; 

 both sexes have more black on the carpus and tarsus than in the spe- 

 cimen of ^. redunca in the same museum. 



Colonel Hamilton Smith formed a genus for two pairs of horns on 

 part of the frontal bones in the College of Surgeons belonging to this 

 group of Antelopes, which he called Rajphicerus acuticornis and R. 

 subulata (Griffith, A. K. t. 181. f. 2, 1). The figures are not sufli- 

 cient to identify the species, and we now know that the horns of the 

 same species differ greatly in individuals of the same species, and 

 during the growth of the same specimen. R. acuticornis may be the 

 horns of the Duyker Boc, Ceph. Grimmia 1 

 [To be continued.] 



LINN.EAN SOCIETY. 



December 3, 1850. — Robert Brown, Esq., President, in the Chair. 



Dr. Adolph Schlagintweit, at the request of the President, gave a 

 summary of some of the principal results of the investigations of 

 himself and his brother into the Vegetation of the Alps in con- 

 nexion with height and temperature, as contained in their " Unter- 

 suchungen ueber die physikalische Geographic der Alpen." 



He stated that very remarkable differences are to be observed in 

 the limits of the altitude of vegetation in the district of the Alps. In 

 the mean results for large divisions, we may plainly recognize the 

 influence of geographical position, as well as that of the nature of 

 the soil, and of the massiveness of the mountain range. The limit in 

 fact becomes higher the more we approach the southern and western 

 groups, a phsenomenon which is connected with the general changes 

 of climate. The mean temperature varies in these latitudes from 

 0"5° to 0*7° of Celsius for one degree; and at the same time the 

 isothermal lines show an evident inclination from west to east. Many 

 very essential differences cannot, however, be explained by geogra- 

 phical position alone ; another important influence is dependent on 



