374 Scientific Intelligence — Geology. 



ing the mode by which the transport of diluvian blocks or 

 boulders is effected. — M. Huot, who was also an eye-witness 

 of a part of this phenomenon, added some facts to the com- 

 munication. The nature of the soil, which was composed of 

 calcareous schist and of a black marl, must have necessarily faci- 

 litated the eboulement. A cloud of dust rose to a great height 

 for many days after the event, which, from a distance, had all 

 the appearance of a volcanic eruption. It was remarked, that 

 a person might walk upon the fluid mass almost at the same in- 

 stant as it was extending itself in all dimensions. At the extre- 

 mity of the valley, a deep valley of erosion was hollowed out in 

 the Taswey. 



9. Trade in Chromate of Iron, — Many years ago chromate 

 of iron was discovered by Professor Jameson in the serpentine 

 rocks of the Shetlands, and afterwards on the mainland of Scot- 

 land. This observation was in 1820 mentioned in one of the 

 editions of his System of Mineralogy. Afterwards, his pupil, 

 the now well known and distinguished geologist, Dr Hibbert, 

 found chrome-ore in such quantities in the Shetland groups, 

 that the quarries of it opened after his visit have reaHzed a very 

 considerable return to the proprietors. It is exported from the 

 Shetlands as a raw material. Since the year 1826 this ore of 

 iron has become in Norway, where it was discovered by the ce- 

 lebrated geologist Esmark, an article of trade. It was, until 

 the year 1831, exported in the rough state, and with but com- 

 paratively little profit to the proprietors of the ground, to Al- 

 tona, Hamburgh, Petersburg, England, and Holland. In the 

 year 1830 not less than 1133 ship-pounds were sent to Havre 

 de Grace alone. It being considered more profitable to export 

 the prepared chrome in place of the crude ore, a company has 

 been g©t up at Drontheim for this purpose, which purposes to 

 supply the cotton printers in Britain, France, and Germany, and 

 also the porcelain manufactories, with prepared chrome. 



10. Ehrenherg's new Discovery in Palaontology — Tripoli 

 composed wholly of Infusorial Exuvia. — At the Royal Aca- 

 demy of Sciences of Paris, July 11th, the following letter was 

 communicated, dated Berlin the 3d of July, from M. Alexan- 

 der Brongniart : — " I have to-day become acquainted with a 



