234 MATER i A MEDIC A AND THERAPEUTICS. 



Composition. Logwood contains tannic acid, and a peculiar 

 colouring principle, hcematoxylin, Ci H 14 6 , occurring in colour- 

 less crystals, which become red on exposure to light, the 

 solutions undergoing various changes of colour with acids and 

 alkalies, and coagulating gelatine. The decoction precipitates 

 perchloride of iron violet blue, acetate of lead and other 

 metallic salts a beautiful blue. Other less important substances 

 occur in logwood. 



Incompatibles. Mineral acids, metallic salts, lime-water, 

 and tartar emetic. 



Preparations. 



1. Decoctum Hgematoxyli. 1 in 20. Dose, 1 to 2 fl.oz. 



2. Extraction Hsematoxvli. Aqueous. Dose, 10 to 30 gr. 



ACTION AND USES. 



Haematoxylum possesses the astringent action of tannic 

 acid, and may be used in the same class of cases. See Gfalla. 



Cassise Pulpa CASSIA PULP. The pulp ob- 

 tained from the pods of the Purging Cassia, Cassia 

 Fistula. Imported from the East Indies, or recently 

 extracted from pods imported from the East or West 

 Indies. 



Character? of the pods. Cylindrical, a foot or more in length, 

 slightly curved, woody, indehiscent, black, rounded, divided by 

 septa into colls, each containing a seed and viscid pulp. Of the 

 pulp : blackish-brown, viscid, sweetish disagreeable taste, and 

 somewhat sickly in odour, usually containing the seeds and 

 dissepiments. 



Composition. Cassia pulp contains sugar, pectin, mucilage, 

 and a purgative principle supposed to be allied to cathartic 

 acid. See Senna. 



Cassia Pulp is contained in Confectio Sennse, about 1 in 8. 



ACTION AND USES. 



Cassia pulp is a laxative, given only as an ingredient of 

 Confectio Senme. 



Tamarindus TAMARIND. The preserved pulp 

 of the fruit of Tamarindus indica. Imported from the 

 West Indies. 



