Description of Pelokonite. IdS 



in the notice on copper and manganese ore, mention is made of 

 a mineral from the Tierra Amarilla in Chili, but which cannot 

 be the pelokonite. 



Pelokonite is very soluble in muriatic acid, less so in nitric. 

 The muriatic solution has a pistachio green colour, and reacts 

 on iron, manganese, copper, and phosphoric acid. 



This mineral agrees in many of its properties with those sub- 

 stances which M. Haidinger has collected together into one or- 

 der, that of the " Terene." 



Poggendorfs Annalenjbr 1831. 



Some Preliminary Experiments upon the Pod of Ccesalpinia 

 coriaria, or Dividivi. By Mr Rodsey. Communicated 

 by Captain Macadam, Royal Marines. 



1. One portion of dividivi, as I received it, on being slightly 

 bruised in a mortar, and sifted, was divided into eight parts 

 powder and seven gruff. Eighteen ounces being more bruised, 

 gave as follows : — 



Seed J oz., husks or gruff 4| oz. = 4f oz. ; powder 12 J oz. ; 

 loss in fine powder | oz. = 13f oz., which is the same as three 

 parts powder and one gruff. A very large portion of the pul- 

 verizable substance appeared to have been bruised off, in ex- 

 tracting the seeds before it reached me, and hence I am of opi- 

 nion, that it bears to the husky part a much larger proportion 

 than what is above stated. As the great lightness of the article 

 adds so much to its freight, it seems desirable that the gruff re- 

 siduum should be separated by a mill, on the spot where it is 

 grown ; by this means one-half at least may be saved in the 

 freight. Considering, therefore, that the powder will become 

 the commercial article, I have confined my experiments to that 

 portion ; but it is probable an analysis of the interior or husky 

 part of the pod may lead to its recommendation for some use- 

 ful purpose where it grows, as it will be a refuse, if too weak for 

 the tanner's use. 



% In conducting these experiments upon dividivi, it was my 

 object to compare it with some other articles of the materia me- 

 dica, that I might the better be enabled to judge of its probable 

 utility. The articles I selected were oak-bark, kino terra japo- 



