( 231 ) 



For want of a direct (ieteriniiiixtioii oftciriperaluro we may nienlion 

 that ill a bottle of mud-water, taken from the outlet to the Pentoe 

 and already cooled down by rain- and brookwater, the thermometer 

 still showed 75° C. The volume-ratio of suspended solid matter of 

 this mud-water amounted to 12,2 7o- 



In a sample sent for chemical examination to the Head-office 



of the jMining-Department, were found — by the mining-engineer 



E. C. Abendanon, (Verslag van het Mijnwezen van het 9'- kwartaal 



van 190J, bi;)lage der Jav. Ct. van 15 Nov. J901 N". 91 p. 1-2): 



A. Mud, dried at 120° C: 



Insoluble in HCl 83,35 "/„ 



in which SiO^ 73,95 7o (perhaps meant of the residue, then in 

 reality 61,64 "/J ; 



Soluble in HCl 



Fe,03 0,0455 gv. = 2,27 „ 

 AUG, 0,1680 „ = 8,40 „ 

 CaO 0,0555 „') = 1,44 „ ') 



95,46 7„ 



Whether the remaining 4,54 7,, '^'^^ been controlled by direct deter- 

 mination does not appear. This remaining part should contain especially 

 the amount of alkalies and perhaps of colloidal solved silicious acid, 

 to which as well as to the possible presence of free SiOa no attention 

 seems to have been paid. 



B. Per 300 cM'' of the water obtained: 

 A1,0, 0,0265 gr. = 0,<S8 gr. p. L. (ought to be 0,088 gr. j). L.) 

 CaCO, 0,1575 „ =0,714 „ CaSO, p. L. 

 BaSO, 0,6540 „ =0,96 „ H._,S(), „ „ (in i-cality 0,917 gr. p. L.). 



H('l, HNO.,, Mg and K-salts absent, strong acid roaction by free 

 sidphuric acid. 



The contradictions in the ligurcs (pioted allow only of presuming 

 that the water contained per liter: 



bound by Al^O, 0,253 gr. sulphuric acid 

 ,, ,, Lav) 0,514 ,, ,, ,, 



(),7(i7 gr. 

 and consequently per liter 0,917 — (),7()7=:0,150 gr. free sulphui-ic acid. 

 Sulphuretted hydrogen could not be detected at IJalavia, but at 

 the spring it could be very distinctly by the comparatively rough 



1) If these ligures reCer to the same quantify of 2 gr, of niud used (or the 

 determinaliün of Fe and Al, they need correction. 



