1002 DR THOMAS R. FRASER ON STROPHANTHUS HISPIDUS. 



3. Strong nitric acid (Ph. Brit. ) produced a pale brown solution. 



4. Dilute nitric acid (10 per cent.) slowly dissolved the extract, forming a pale yellow 

 solution. 



When this solution was heated between 115° and 130° F., it gradually became 

 faintly red, then blue appeared at the margins, and the centre became canary-yellow, 

 then pinkish streaks extended across the yellow centre, and, finally, the whole became 

 permanently of a gamboge-yellow colour. 



5. Strong hydrochloric acid (Ph. Brit.) produced a yellowish solution. 



6. Dilute hydrochloric acid (10 per cent.) also produced a yellowish solution. 



When this solution was heated between 115° and 130° F., it became greenish- 

 yellow, brownish-green with faint blue patches, deep violet, and, finally, very dark 

 green. 



7. Acetic acid (Ph. Brit.) produced a pale brownish solution. 



8. Iodic acid produced a pale brownish solution, in which, however, no blue colour 

 was developed by starch. 



9. Strong snlphnric acid and bichromate of potassium produced a greenish-brown 

 colour. 



10. No material change was caused by strong sulphuric acid, rectified spirit, and neutral 

 solution of ferric chloride ; nor by sulphuric acid and bromine water. 



11. Solution of potash, soda, or ammonia produced a bright yellow solution, but the 

 yellow colour immediately disappeared on the addition of dilute sulphuric, hydrochloric, 

 or acetic acid. When the alkaline yellow solution was boiled, it evolved a methylamine 

 odour and alkaline fumes, and in a short time it became reddish-brown in colour, and 

 lost much of its bitterness. 



12. Phospho-molybdic acid produced a green colour, which immediately changed to blue 

 on the addition of an alkali. 



Solution of Extract in Water (2 per cent.). 



1. Acetate of lead produced a faintly yellow flocculent precipitate. 



2. Subacetate of lead produced an abundant yellowish flocculent precipitate. 



After the lead precipitates in 1 and 2 had subsided, the supernatent fluid was 

 nearly colourless and intensely bitter. 



3. Solution of ferric chloride (Ph. Br.) caused a greenish-yellow colour, and afterwards 

 a slight precipitate. 



4. Nitrate of silver produced a faint opalescence, which afterwards became a dark 

 precipitate. 



5. Mercurous nitrate produced a white cloudiness, which afterwards subsided as a 

 slight grey sediment. 



6. Cupric sulphate produced a slight haziness, which, on subsidence, left a pale green 

 fluid. 



