M. A. Brongniart on some Fossil Vegetables, 289 



Fig. 2. Sigillaria reniformis. Ad. B. 



Sigillaria with flattened ribs, about 15 lines broad ; bark thick, 

 smooth externally, striated internally, cicatrices small, from three 

 to four lines broad, reniform, notched above and marked with 

 three vascular fasciculi ; internal cicatrices oval, large, double. 



Gathered in the coal-mines of Mons. 

 Fig. 3, 4. Sigillaria elofigata. Ad. B. 



Sigillaria with convex angular ribs ; bark pretty thick, smooth ex- 

 ternally, striated internally ; cicatrices oblong, truncated at the 

 two extremities, marked with three vascular fasciculi above, 

 the cicatrices are close together, and the interval between them 

 is rugose and transversely striated. 



Var. cc. minor. Ribs from live to six lines broad ; inner cicatrices 

 rounded, (fig. 3). 



Var. &. major. Ribs from eight to ten lines broad ; inner cica- 

 trices elongated, linear, (fig. 4). 



Occurs in the coal-mines of Charleroi. 

 Fig. 5. Sigillaria mamillaris. Ad. B. 



Sigillaria with ribs alternately narrowed, from four to five lines 

 broad, forming lamellae which support narrow cicatrices, trun- 

 cated above, widened and rounded beneath, marked toward 

 their upper edge with three vascular fasciculi. Bark very thin, 

 striated transversely beneath the cicatrices, smooth internally ; 

 internal cicatrix rounded. 



Occurs in the coal-mines of Charleroi. 



Obs. The three first species difi^er essentially from all those figured 

 by M. Sternberg, Schlotheim, Rhode, &c.; the last species pretty 

 much resembles Sternberg's Lepidodendron alveolare ; but it is 

 distinguished from it by its cicatrices being wider set, and its 

 bark striated in the interval of the cicatrices. — Annales des Set' 

 ences Naturelles, Jan. 1825, p. 23. 



Professor P. Pkevost, upon the Magnetical hifiuence of 



the Sun. 



i^ UMEROUs observations made at different periods, appear to 

 attest that the southern hemisphere is colder than the northern. 

 This fact is explained by the theory of radiating caloric, and is 



JULY OCTOBER 1826. T 



