Intelligence and Miscellaneous Articles. 



Philosophical Society were deeply corroded from chemical action. 

 The explosion has naturally been attributed to this attack of the 

 sides by the acid, and doubtless an acidulated liquid ought to attack 

 the sides. 



Now we know that sulphuric acid, even in very small quantity, 

 imparts to water the property of undergoing retardations of ebullition 

 much more considerable and much more frequent than those of pure 

 water. If, then, boiler explosions arise from a retardation in the 

 ebullition of water when the pressure diminishes in the boiler, as I 

 explain in my Note, it is seen that the two accidents in England are 

 easily explained, inasmuch as the feeding water contained a little 

 acid. — Comptes Rendus, June 6, 1864. 



APPLICATION OF ZEIODELITE. 



Zeiodelite is a mixture prepared by melting together 20 to 30 parts 

 of roll sulphur with 24 parts of powdered glass or pumice, and which 

 forms a mass as hard as stone, that resists the action of water and 

 of the strongest acids. Prof. R. Bottger recommends it, therefore, 

 for making water - and air-tight cells for galvanic batteries. — Pog- 

 gendorff's Annalen, July 1864. 



DETERMINATIONS OE TEMPERATURE IN THE DEPTH OF SOME 

 BAVARIAN MOUNTAIN LAKES. 



In the Sitzungsberichte of the Royal Bavarian Academy of 1862, 

 Prof. Jolly describes a bathometer and aminimum thermometer of his 

 invention, and gives some observations of the temperature at various 

 depths in the Konigssee, the Obersee, and the Walchensee, which 

 may find a place here. 



Depth in 



Temperature 



Depth in 



Temperature 



metres. 



in degrees C. 



metres. 



in degrees C. 



Konigssee, 



1862, Aug. 



Obersee, I 



862, Sept. 







o o 



14-9-15-2 







o 



15-1 



22-6 



7-89 



271 



755 



26-8 



6-61 



31-4 



912 



37-8 



6-58 



62-3 



6-59 



672 



6-00 







95-5 



5-83 



Walchensee 



, 1862, Oct. 



104-3 



5-81 







153-3 



5-38 







150 



163-2 



5-50 



58-3 



676 



198-0 



5-44 



976 



607 



204-1 



5-52 



98-6 



612 



216-5 



5-34 



1070 



5-91 







248-8 



517 



Hence in these lakes (as in those of Switzerland) the temperature 

 approaches, without actually attaining, that of the maximum density 

 of water (from inadequate depth), and without following any regular 

 progress in its decrease. — PoggendorfTs Annalen, August 1864. 



