102 Mr. J. Hogg and Sig.Tenore on the comparative Influence 



of osm indium have the same form, angles and cleavage as the 

 preceding. Colour lead-grey, like antimony glance. Hard- 

 ness that of the preceding variety. Specific gravity of several 

 crystals, which together weighed 1*5205 grammes, 21*118, 

 the temperature of the water being 13° Reaumur. Heated 

 before the blowpipe on charcoal, it does not melt, but the sur- 

 face becomes dull, and turns black, giving out at the same 

 time a penetrating smell of osmium. 



XVI. On Phenakite, a new Mineral from the Ural. By 

 Nils Nordenskiold. # 



'"PHIS mineral is found in Perm, 85 wersts from Cathari- 

 * nenburg. Its form is rhombohedral PP ae 115*25, &P 

 = 147*42^, wP= ! 22*1 7 J nearly. Cleavage parallel to??. 

 Hardness greater than that of 

 (juartz. Specific gravity 2*969. 

 Lustre vitreous. When pure it 

 is transparent and colourless. 

 Sometimes its colour is a bright 

 wine yellow inclining to red : it 

 is also found white and opake. 

 According to Hart wall, it is 

 composed of silica 55*14, glu- 

 cine 44*47, and traces of alumina and magnesia, amounting, 

 together with the loss, to 0*39. The composition of this mi- 

 neral is expressed by the formula Be + 2 S. 



XVII. On the Influence of the Climate of Naples upon the 

 Periods of Vegetation as compared with that of some other 

 Places in Europe. By John Hogg, Esq., M.A., F.L.S. 

 F.C.P.S., $c. 



[Continued from page 50 : and concluded.] 



III. Efflorescence. 



J^LOWERING (Efflorescentia), or the time in which plants 

 unfold their first flowers, is itself also subject to variations 

 no less remarkable than those mentioned in the other periods 

 of vegetation already described. 



By comparing the observations reported by Linnaeus in his 

 Philosophia Botanica upon the flowering of many plants in 

 the neighbourhood of Upsal, and those by M. Chavassieux 

 d'Audibert in the environs of Paris, with my own researches 



* From Poggcndorff's Annalen, vol. xxxiii. 



