458 BOTANICAL GEOGRAPHY. 



were less in those found by Harris in Skoa. (See the preceding Ann. Hep. 

 p. 382.) C. H. Schultz has described some of Riippell's new Cichoraceae 

 from Abyssinia (loc. cit. p. 47). 



Endlicher and Diesing are describing new Algae from 

 the Natal Colony (Bot, Zeit., 1845, pp. 288-90). 



IV. AMERICA. 



Seller has made some isolated systematic remarks upon 

 a collection of plants from the coasts of Davis's Straits 

 and Baffin's Bay, in the ' Annals of Natural History ' 

 (vol. xvi, pp. 166-74). 



Forry has compared the results obtained at the meteoro- 

 logical stations of the United States since 1819, and 

 traced the distribution of heat in various points of view 

 (Amer. Journal of Science, 1844, extracted into the 

 Biblioth. de Geneve, vol. Ivii, pp. 140-50). 



The unusual, nay, unparalleled accumulation of fresh water in the Canadian 

 lakes, which, at a mean level of 1000', include a surface of almost 4000 

 square geog. miles, procures for the northern states an insular climate for a 

 very considerable distance into the eastern forest-region. Hence the difference 

 between the summer and winter does not become excessive until we 

 arrive just beyond the Mississipi, as also between the lakes and the 

 Atlantic Ocean ; in Lower Canada, e. g. the extremes of temperature are 

 somewhat greater than in Michigan on the one hand, and the coast of Nova 

 Scotia on the other. In the southern states, the annual curve resulting from 

 the influence of the two oceans becomes still less arched than in the north, 

 until, in Florida, it gives way to an almost tropical uniformity. The diffe- 

 rence between the temperature of the summer and winter amounts there at 

 Key West to only 43 F. ; flowers bud there throughout the year without any 

 general winter-sleep . During a space of six years th e thermometer never rose, 

 at this station, above 89'6F., and never sunk below 44' 6 F. The atmo- 

 spheric precipitations are unequally distributed in Florida : in the central 

 districts there are 309 fine days in the year, on the coast 250, and at the 

 lakes, in the northern part of the state, only 11 7; but the air generally 

 abounds in moisture, and the formation of dew is common. 



Macnab has continued the Botanical Report of his 

 travels (Ann. Nat. Hist.,, xv, pp. 65 and 351). Berkeley 

 has published an account of some new Fungi from Ohio 

 (Lond. Journ. of Bot., 1845, pp. 298-313). 



