56 



Muscologia Itineris Assamici. 



the means of tracing the mineral deposit. The Great Tenasserim 

 river has passed through the manganese bed in one spot, 2^ miles 

 removed from two other points at which it occurs to the north and 

 south, at both of which it is likewise discovered near the surface 

 by the action of the streams Thuggoo and Therabuen. The pro- 

 bability therefore, is, that it is an horizontal deposit covering many 

 square miles. But without indulging in conjecture, there is suffici- 

 ent at the localities referred to, to indicate large quantities of man- 

 ganese ore which could be collected by penetrating through the soil 

 lying above it, and immediately near the spots in which it is now 

 exposed to the day. 



It occurs in the form of the black oxide, and is the manganese of 

 commerce. It is largely consumed in Europe in the preparation of 

 bleaching compounds, and when pure, is valuable to the manufacturer 

 of glass.* 



6. The soft black ore, No. 1 , is a hydrate of the peroxide of man- 

 ganese, known under the name of wad. It contains of water two 

 equivalents, or 29 per cent. 



Iron, 1.96 grains by analysis; its specific gravity is 1.47. 

 The specific gravity of the grey peroxide, No. 4, is 1 .46. 

 Moulmein, \\th September, 1841. 



Muscologia Itineris Assamici , or a Description of Mosses collected 

 during the Journey of the Assam Deputation, in the years 1835 and 

 1836. ByW. Griffith, Esq. Assist. Surgeon, Madras JSstabt. 



(Continued from page 514, vol. ii.) 



BrachymeniuMj Hook. Brid. Bryol. univ. 

 1. Brachymenium contortum, Griff. 



Caule brevi simplici vel fastigiatim ramoso, foliis siccitate con- 

 tortis, oblongo-lanecolatis marginibus incrassatis apicem ver- 

 sus denticulatis, capsula erecta elongato-obovato-pyriformi. 



Hab : Super arbores pinetorum Moflong. 



Caulis brevis, vix bilinealis, innovationibus ramosus, et ssepius 

 dichotomus. Rami erecti, simplices, caule paullo longiores. 



* It is used in the fumigation of ships, and has hitherto been imported for the purpose 

 from Europe. An application has been made to Capt. Tremenheere for a fewmaunds as a sam- 

 ple, and if the Tenasserim manganese is found to answer, the article may be omitted in 

 future indents on Europe for Medical Stores.— Ed. 



