Report from ttie Botanical S<< 



ammonia. It was then dried, ignited, and weighed, and gave of phosphate 

 of magnesia 80 grains, = 1*60 per cent. = 1-03 grains per cent, phos- 

 phoric acid. In a second experiment, 100 grains of the refuse gave 

 1*56 grains phosphate of magnesia, = 1*002 grains phosphoric acid. 



<!. Estimation of the Carbonate of Lime. — To the solution filtered from 

 t In- iron and alumina of the analysis of 60 grains, oxalate of ammonia was 

 added, which gave a precipitate consisting of oxalate of lime, affording 

 of carbonate 2* = 3*33 CaO C0 2 per cent. 



7. Estimation of the Magnesia. — To the solution filtered from the 

 lime, phosphate of soda was added, and from the phosphate of magnesia 

 obtained, the quantity of magnesia was calculated. The amount of 

 phosphate of magnesia per cent, was 2*75 grains = 1-63 magnesia. The 

 constituents of the refuse of the black cake are therefore as follows, with 

 the addition of other trials : — 



Carbon, 3623 3480 3450 



Water, 1900 1980 18*35 



Sulphate of potash, 504 5-65 5 92 



Sulphate of lime, 675 613 



Silica, 10-75 10-30 



Oxides of iron, "1 



lovl 



} 



Sulphuret of iron, 



Carbonate of lime, 3*33 4*96 



Phosphoric acid, 1-03 1-002 



Alumina, 2-33 2-65 



Magnesia,. 163 



10000 

 In some of the analyses, a quantity of titanic acid was obtained along 

 with the silica, obviously derived from titanium contained in the iron pots. 



Mr. Keddie gave in the following 



Report from the Botanical Section. 



January 11, 1848. — The Treasurer acknowledged a gift of £5 from 

 the Philosophical Society for the Herbarium. 



Dr. Walker Arnott exhibited specimens of plants illustrative of the 

 genera of Chrysobalanea), and made some observations upon them, show- 

 ing that the genus Prinsepia should be rejected from that order, as being 

 more allied to Prunus, belonging to the order Amygdaleae. 



February 8. — Dr. Walker Arnott explained the general principles of the 

 OaqwIWy theory, in order to illustrate the structure of the fruit of the 

 Cucurl »it;i« t ;i\ He stated the views entertained on the subject by Scringe 

 and De Candolle, according to whom the middle of the back of the car- 

 pcllary loaf is in the axis, whilst the upper surface and margins are 

 towards the outside. lie also noticed the explanation gi\en by him- It 



