DR THOMAS R. FRASER ON STROPHANTHUS HISPIDUS. 



1007 



Table X. — Summary of Analyses in which Extract of Strophanthus was decomposed by Acids. 







Per- 













to 



Quantity 

 of Extract 



in 

 Grammes. 



centage 



of 



Extract 



in the 



Solution. 



Acid and 

 its Per- 

 centage. 



Strophanthidin 



produced in 



the Cold. 



Glucose 



produced 



in the 



Cold. 



Strophanthidin produced 

 after Heating. 



Glucose pro- 

 duced after 

 Heating. 



15 



0-25 



10% 



No added acid. 



None. 



None. 



No appreciable production. 



After boiling for 

 half an hour, 

 about 1 %. 



16 



0-25 



5% 



Sulphuric acid, 

 0-4%. 



In five days, 18*3 

 % of crystalline 

 strophanthidin. 



23-4% 





... 



17 



25 



5% 



Do., 0-4%. 



... 





After boiling for half an hour, 27 '4 % 

 of crystalline, brownish-yellow stro- 

 phanthidin. 



After boiling for 

 half an hour, 

 27-9%. 



18 



1-0 



2-5% 



Do., 1 %. 







After boiling for four hours, 31 "6 % of 

 yellowish-brown amorphous deposit. 



After boiling for 

 four hours, 21 "3 % 

 by Fehling's re- 

 agent, 22-4 % by 

 fermentation. 



19 



0-5 



3-4% 



Do., 1-6 %. 



In five days, 30 '45 

 % of yellowish- 

 brown crystal- 

 line strophanthi- 

 din. 



26% 



After boiling one half of the filtered 

 solution for half an hour, only a 

 little brown amorphous substance. 



After boiling for 

 half an hour, 



25%. 



20 



0-25 



3-2% 



Do., 32%. 





After heating to 170°, 6"3 % of brown 



After heating to 















amorphous substance ; on rendering 



170°, 21 %. 















the cold filtered solution alkaline, 

















13'73 %of crystalline strophanthidin. 





21 



0-25 



3-2% 



Do., 1-6%. 







After heating to 170°, 9 % of amor- 

 phous brown substance. 



After heating to 

 170°, 21 %. 



22 



25 



4% 



Do., 2%. 



In three days, 27 - 21 

 % of brownish- 

 yellow crystal- 

 line strophanthi- 

 din. 



20% 



After boiling one half of the filtered 

 solution for half an hour, a slight 

 amorphous deposit. 



After boiling for 

 half an hour, 

 20-8 %. 



23 



0-25 



4% 



Do., 2%. 



In five days, 207 

 % of crystal- 

 line strophanthi- 

 din. 



20-5% 







24 



0-25 



1% 



Hydrochloric 

 acid, 1 %. 







After heating for half an hour between 

 98° and 100° F., no crystallisation. 



After heating for 

 half an hour be- 

 tween 98° and 

 100° F., 5-5%. 



25 



0-5 



4% 



Do., 0-1 %. 



In six days, a 



24-5% 



After heating one half of the filtered 



After boiling for 











slight non-crys- 



(?) 



solution between 120° and 140° F. 



half an hour, 











talline deposit. 





for half an hour, 16 - 32 % of crystal- 

 line strophanthidin. The filtrate 

 boiled for half an hour, deposited a 

 further small quantity of crystalline 

 strophanthidin. 



257 %. 



26 



0-5 



5% 



Nitric acid, 



In five days, 29"9 % 



24% 



After boiling one half of the filtered 



After boiling for 









2%. 



of crystalline stro- 

 phanthidin. 





solution for half an hour, 1*5 % 

 of crystalline strophanthidin. 



half an hour, 



27-2%. 



27 



5 



5% 



Phosphoric 



In five days, 6 % 



12-8% 



After boiling one half of the filtered 



After boiling for 









acid, 2 %. 



of crystalline stro- 

 phanthidin. 





solution for half an hour, 26 - 42 % of 

 crystalline strophanthidin. 



half an hour, 

 22%. 



28 



0-5 



5% 



Acetic acid, 



In six days, only a 



2% 



After boiling one half of the filtered 



After boiling for 









2%. 



slight amorphous 

 deposit. 





solution for half an hour, 12 "9 % of 

 crystalline strophanthidin. 



half an hour, 

 15-34%. 



29 



0-25 



2-5% 



Oxalic acid, 



In five days, a 



16% 



After boiling one half of the fitered 



After boiling for 









2%. 



slight amorphous 

 deposit. 





solution for half an hour, 10 "4 % of 

 crystalline strophanthidin. 



half an hour, 

 19-4 %. 



30 



0-25 



2-5% 



Hydrocyanic 



In five days, a very 



Glucose 



After boiling one half of the filtered 



After boiling for 









acid, 2 %. 



slight amorphous 



not suffi- 



solution for half an hour, only a 



half an hour, 











deposit. 



cient to 

 be esti- 

 mated. 



minute, apparently amorphous de- 

 posit. 



3%. 



