224 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



another, proidonite, is fluoride of silicon. Atelite is a hy- 

 d rated oxychloride of copper ; cryptohalite consists of am- 

 monium silicofluoride ; chloraluminite is aluminic chloride. 

 Chlorothionite contains copper, potassium, chlorine, and sul- 

 phuric acid ; pseudocotunnite is a double compound of the 

 chlorides of potassium and lead. Other species described 

 by Scacchi are chlorocalcite, ery throsiderite, chloromagnesite, 

 cupromagnesite, and microsommite. Associated with all 

 these were the previously known minerals hematite, mag- 

 netite, tenorite, sylvite, halite, sal ammoniac, molisite, 

 aphthitalite, anhydrite, pyroxene, byssolite, chrysolite, and 

 apatite. 4 Z>, December^ 1875. 



DREDGING FOR AMBER. 



According to an official report from Memel, Germany, an 

 establishment has been organized for gaining amber by dredg- 

 ing for it in the Kurische HafF, near the village of Schwarz- 

 orts, situated about twelve miles south of Memel. It has 

 been known for many years that amber existed in the soil 

 of this place, from the fact that the dredger employed by 

 the government for the purpose of clearing away the shallow 

 spots near Schwarzorts which impeded navigation brought 

 up pieces of amber, which were duly appropriated by the 

 workmen, and at the time no particular attention was paid 

 to the matter. Some time afterward, however, some specu- 

 lators associated, and made an offer to the government not 

 only to do the dredging wherever required at their own ex- 

 pense, but to pay a daily rent, provided the amber which 

 they might find should become their property. This pro- 

 posal was accepted, and the rent fixed at fifteen thalers, and 

 later at twenty -five thalers, for each working day. The 

 dredo-inoj was be2:un w^itli four machines worked bv men and 

 one by horses. Judging from the extended business trans- 

 actions in this matter, its results must have been extremely 

 profitable. At present the work is carried on with eighteen 

 steam -dredges and two tug -boats, the whole managed by 

 about 1000 laborers. i!/arc/i 5, 1875, 170. 



INTERESTING IRON METEORITE. 



The iron meteorite from Rittersgrau, Saxony, which fell in 

 the year 1833, has recently been described. The weight of 



