182 ANNALY9IS OF 



of the common cultivated Mallows ; the petals cre- 

 nulate and distinctly unguiculate. Capsules one 

 seeded, and roughened with depressed punctures, not 

 spontaneously opening, and as in Malva and Althaea 

 disposed in a ring. 



This genus, of which the species are hardy orna- 

 mental and perennial, appears to afford an additional 

 link of connection between the genera, Sida and 

 Malva. 



Cultivated by Mr. William Dick in the garden of 

 the University of Pennsylvania, by whom it has been 

 dedicated to the author. 



Description and Analysis of the Table Spar, from 

 the vicinity of Willsborough, Lake Champlain. 

 By Lardner Vanuxem. Read March 5, 1832. 



This mineral, which by some was considered to be 

 Ichthyopthalmite, and by others Grammatite, ap- 

 pears in masses, composed of imperfectly tabular 

 crystals, irregularly grouped together, of a white 

 colour, and presenting a slight pearly lustre in al- 

 most every directiou in which it is viewed. The 

 crystals present natural joints, parallel to a quadran- 

 gular prism, with a rhombic base, whose angles are 

 about 94 and 86°; other cleavages again divide this 

 prism according to the diagonals of its base ; all the 

 joints are easily separated with a knife, and all of 

 these apparently presenting the same degree of 

 smoothness and lustre : no joints are perceptible in 

 the direction of the base. Itis fusible into a transparent 



