16 GEOLOGICAL MEMOIRS. 



pounds avoirdup.). A hundred pounds weight (123*4 pounds 

 avoirdup.) of this kaolin, carefully washed and refined, costs at Vienna 

 2 florins, 24 kreutzners (4 shill. 9f pence). 



The analysis of the kaolin gave — Silica 48*1 per cent. 



„ „ „ Alumina... 38*6 ,, 



jj J, ,, water ... lo o ,, 



Lime and Oxide of Iron ... traces. 



Chev. von Hauer attempted to decompose this kaolin by treating 

 it with gypsum under the influence of high temperature, this method 

 having proved successful with other mineral substances. The kaolin, 

 mixed with gypsum in a proportion adequate to the quantity of 

 alumina contained in it, was heated in a roasting- furnace to a moderate 

 red heat, so as to prevent the decomposition of the sulphate of alumina. 

 After this preliminary operation, the whole of the alumina could be 

 extracted by cold sulphuric acid very considerably diluted. The 

 water for elixiviation is to be mixed with no more acid than what is 

 strictly necessary (together with what is contained in the gypsum) 

 to form a trisulphate of alumina. The filtrated solution is adapted for 

 the production of chemical preparations containing alumina. As yet 

 this method has only been used in the laboratory ; but it may be ex- 

 pected to be profitably employed for technical purposes. 



[Count M.] 



On the Lignites of the Hausruck, Upper Austria. 

 By Baron Hingerau. 



[Proceedings of the Imp. Geol. Institute of Vienna, JanuaiylS, 1856.] 



The Hausruck-Wald is the eastern portion of the mountain-range 

 running between Mattighofen, Friedberg, Frankenburg, Voeklabruck, 

 Wolfregg, Haag, and Ried, along the frontier between the Hausruck 

 and Inn Circles. The western part of the range bears the name of 

 Kobernauser Wald. 



The succession of strata in the lignitic deposits of the Hausruck- 

 Wald (in descending order) is — 



1. Gravel and conglomerates, 30 klafters (62*22 yards), and more 

 in places. 



2. Sandy clay, 6 inches. 



3. Lignite, 1 to 3 feet. 



4. Argillaceous marl, known by the provincial name of " Schlier," 

 variable in thickness, at Thomasroith 1 5 klafters (31*11 yards) . 



5. Lignite-bed, 2 klafters (4*158 yards). 



6. Clay, with fragments of coal, variable in thickness. 



7. Lignite-bed, 1 to 1^ klafter (2-074-3-111 yards). 



8. Bluish argillaceous marl, or " Schlier," frequently occurring in 

 this part of Upper Austria, at a level of 1000 to 1800 feet above the 

 sea. Its fauna, judging from the fossils collected between Ottnang 

 and Wolfsegg, and determined by Dr. Hoernes, is analogous to that 

 of the Vienna "Tegel," having a "Neogene" character. 



