ON EUCALYPTUS KINOS. 95 



Mr. J. H. Hustwick 1 points out that with one sample of 

 kino he obtained gelatinized and non-gelatinized tinctures 

 by different methods of working. In one case he treated 

 the granular kino with the alcohol without powdering, and 

 consequently an insoluble portion was left which was dis- 

 carded ; this tincture kept well and was as fluid after two 

 years as when made. In the other the kino was powdered 

 and this tincture readily gelatinized. I have referred to 

 this peculiar experience because it bears directly upon 

 what will be shown later. 



Mr. Rother (loc. cit.) suggests the addition of catechu 

 to the tincture to prevent gelatinization, but from my 

 experiments the addition of a moderate amount of a non- 

 gelatinizable kino to a gelatinizable one does not prevent 

 the ultimate production of a jelly, although it retards it 

 considerably, and in direct ratio to the amount of the 

 former kino or tincture added. (See Table III.) 



Mr. G. W. Kennedy 2 advocates the addition of logwood, 

 but it is probable that this acts in the same w T ay as does 

 catechu, and I do not think it would be finally successful 

 unless it was added in large amount. 



Mr. G. M. Beringer 3 describes a method for making the 

 tincture with diluted alcohol, but this apparent improve- 

 ment was probably due to most of the active gelatinizing 

 principle in the kino being left behind in the "dregs" on 

 the filter. Nor will the freshness of the kino help per- 

 manently although of some advantage, but fresh or aged 

 the cause of the gelatinization appears to be present in the 

 kino, and will naturally do its work in time. So it is with 

 the Eucalyptus kinos that gelatinize, and Mr. Maiden's 

 qualification 4 for Eucalyptus kinos that will make satis- 



1 Pharm. Journ. [3] 2. 260. 



2 American Journ. of Pharm., Feb. 1880. 



3 American Journ. of Pharm., 1903, p. 378. 

 * Pharm. Journ., Oct. 1889, p. 323. 



