ArrENDix. 



153 



COMBRETACETK. 



Myrobalans. 



G. ZoelMl (Arch, der Pharm., 1891, 123—160) states that 

 tlxG tannin of myro^balans is a mixture of two tannins, one of which 

 is the glucoside of gallic acid, yielding upon hydrolysis gallic acid 

 and sugar (dextrose) ; the other tannin present is a tannic acid 

 proper of the formula O^^H^^O^^which at 100"* C. loses two molecules 

 of water. The anhydrous acid C^^H^O' is called ellagic acid (the 

 formula of which is generally given as C^*H«0') ; the hydratcd 

 acid C^'^H'^O'^ is called ellaggenic acid ; the latter forms a pcnta- 

 acetyl derivative, indicating five aud four hydroxyl groups, respec- 

 tively, in the acids. The tauuins were separated by fractional 

 precipitation with lead acetate, subsequently purified by precipitation 

 with sodium chloride and solution in acetic ether. 



Terminalia ehebula. 



Mr 



" Preliminary 



Proximate Analysis of a sample of commercial Myrobalans" to tlie 

 Pharmaceutical Conference, August, 1892. 



A finely powdered and well-mixed sample yielded 7'05 per cent, 

 of moisture and 2 '3 per cent, of ash 



Petroleum Ether Extract ... ( ^f ^ ^^^^^ ^^^^ •- '4^2 



I Wax ... -428 



(^Gallic acid 3*02 



f Tannin 1-80 



Ethereal Extract .. 



5 Green resin ... ,„ '54 



LBrowm resin '97 



r Tannin 18'80 



Alcoholic Extract </ Bitter principle ... 1-9 



I Glucose ... ,.. l"13 



I 



Saccharose 1*25 



Phlobaphane... ... •SG 



Colom'ing matter ... '35 



Pale green substance ... '71 



... 5-10 



Aqueous Extract 



»«■ ••• ••« 



The soft green resin found in the ethereal extract is presumably the 

 " Myrobalamine " of Dr. Apery. Tlie tannin was estimated in tlie 

 aqueous solution of the alcoholic extract by means of copper acetate. 



