Vi ii. Proceedings of the Society. 



Mr. Morris, Vice-Secretary, read a letter from Mr, Danfurd, 

 expressing his thanks tu the Society for having elected him a 

 Member. 



The Vice-Secretary read a letter from Mr. Richard, Direc- 

 tor of the Botanic Garden at St. Denis, Bourbon, presenting 

 to the Society, on the part of Mr. Normand, of the French 

 frigate VoltieeuT, a specimen of petrified wood from Arabia. 

 Ordered to be delivered to the Curator of t lie Mu- 

 seum. 



Mr. Richard's letter states that the sugar-canes at Bourbon 

 had during the last three years been seriously injured by a 

 disease, as to the origin or cause of which he does not feel 

 qualified to give an opinion, but refers to Mr. Lepervanche 

 Meziere. It is satisfactory to learn that this malady has de- 

 creased in the last year. 



Mr. Bojer, Vice-President, laid before the Society two ta- 

 bles, drawn up with great care, in reference to that " pro- 

 perty " of different sugars, which \v«s brought under the 

 Society's notice at the last Meeting. 



The first table shows how the proportion of uncrystalliza- 

 ble matter contained in any sugar, may be ascertained by a 

 clear and easy method. Assuming the ( rystallizable matter 

 of good refined sugar to be to that of molasses as 100 to 0, 

 he has constructed this table from 100 to for sugar, and 

 from to 100 for molasses. To these scales he has attached 

 the relative specific gravity, ascertained in the usual manner, 

 (the temperature being 80° Fahr., Barometer 2S5 (French 

 measure), the sugar being previously dried and then dissolved 

 in equal weight of distilled water. The density of the solu- 

 tion of pure sugar was found to be 1*2301, and that of mo- 

 lasses D174S: difference, 0*553. The molasses used was 

 previously dried in the air-pump over Sulphuric Acid. It lost 



