164 



Scientific Intelligence. — Natural History. 



Analysis of an ore of platina from Barbacoas in the province of 

 Antioquia de la Colinnbia. 



This ore consists of grains which often weigh more than a drachm, 

 intermingled with those which are smaller. The largest grains I 

 found to be composed as follows ; 



Platina, 



Rhodium, 



Iridium, 



Palladium, 



Osmium, 



Copper, 



Iron, 



Quartz, 



Lime, 



84.30 



3.46 



L4G 



1.06 



1.03 



.74 



5.31 



.60 



.12 



98.03 



Ann. de Chim. Avr. 1829 



2. On the Silicate of Iron, of Badenmais, by Prof. Kobell, of 

 Munich* (Annalen de Physik.) — This mineral, reduced to very 

 fine powder, is attacked by hydro-chloric acid. 

 20 parts gave the following results : 



Silica, . . . . . . 6.12 



Protoxide of iron, . . • . 10.32 

 Sulphur, . . • . • . .18 



Water, 3.74 



20.36 



As it is found with pyrites, the sulphur doubdess arises from a 



slight mixture of these latter. 



In making the needful deduction and 



attending to the increase of weight, we have 



Silica, 



Peroxide of iron, 

 Water, 



31.18 — containing oxygen 



50.86 



19.12 



16.25 

 15.59 



16.99 



101.26 



This mineral may therefore be regarded as a silicate of hydrate 

 of iron. — Idem. 



3. On a new mineral^ Htjdro-carhon. — A combustible substance 

 has been found by Colonel Scherer in the interstices of lignite or 



