994 DR THOMAS R. FRASER ON STROPHANTHUS HISPIDUS. 



spirit, could not conveniently be used, especially when extraction by percolation was 

 attempted. The results of a few of these analyses are given below, and in all of them 

 the extraction was accomplished by the process of percolation. 



Extraction by Anhydrous Ethyl Ether (sp. gr. 0'7 SO) followed by Rectified Spirit. 



Analysis No. 3. 



581 grains of seeds from Buchanan, 1885, lost on drying 37'99 grains = water, 6*538 



per cent. 



500 grains of the above dried seeds yielded — 



Ethyl ether extract (18 of ether to 1 of seeds), 160*82 grains, . . = 33*96 per cent. 



Rectified spirit extract (18 of spirit to 1 of seeds), 54*93 grains, . . = 10*986 , 



Undetermined constituents, 27132 grains, ...... = 54*26 „ 



99-206 



Analysis No. 4. 



500 grains of dried seeds from Buchanan, 1885 — 



Ethyl ether extract (13 of ether to 1 of seeds), 165 grains, . . . =33*0 per cent. 



Rectified spirit extract (18 of spirit to 1 of seeds), 53 grains, . . . = 10*6 „ 



Undetermined constituents, 280 grains, . . . . . . =56 ,, 



99-6 



Analysis No. 5. 



6000 grains of seeds from Buchanan, 1885 — 



Ethyl ether extract (12 of ether to 1 of seeds), 2164 grains, . . . =36 - 066 per cent. 



Rectified spirit extract (6 of rectified spirit to 1 of seeds), 48748 grains, = 8*124 „ 



Extraction by Rectified Spirit and subsequent Removal of Fat, &c.,from the Alcoholic 

 Extract mixed with Water by frequent agitation with Ethyl Ether. 



In the next analysis, the ground seeds, after having been dried at 100° F., were first 

 extracted with rectified spirit, and then the fat, &c, was removed from the alcoholic 

 extract by mixing it with a little water and agitating the mixture with successive 

 quantities of ether. The residue obtained on the evaporation of this ether is the " ethyl 

 ether extract" mentioned in the following analyses, and the " rectified spirit extract " is 

 the dry residue obtained by evaporation of the watery solution of the alcoholic extract, 

 after this extract mixed with water had been agitated with successive quantities of ether. 



Analysis No. 6. 

 4000 grains of seeds from Buchanan, 1885 — 



Rectified spirit extract (12 of rectified spirit to 1 of seeds), 362*19 grains, = 9*06 per cent. 

 Ethyl ether extract, 536865 grains, . 13*421 „ 



