Scientific Intelligence • — Arts. $71 
steam-boat upon the Kategatt : A steam-boat navigates the Gulf 
of Finland, between the capitals of Russia and Sweden : A boat 
of a new construction has arrived at Stockholm, in order to be 
employed upon the great lakes which open to Sweden a naviga- 
tion, independent of the passage of the Sound. The trial of a 
steam-boat upon the Danube, between Vienna and Semlin, has 
not entirely answered ; but it is believed that an improvement 
in the construction of the vessel will remedy the inconveniences 
which have been experienced. This communication will facili- 
tate the commerce between Constantinople and all the northern 
parts of Turkey. The beautiful lakes of the Alps are begin- 
ning to be filled with steam-boats; those of the Lake of Constance 
are in full activity ; that of the Lac Majeur is building. These 
vessels, and the new roads, will render twice as quick the com- 
munications between Augsbourg, on the one hand, and Milan 
and Genoa, on the other. An enterprise in which France is more 
directly interested, is that of the navigation from Mayence to 
Kehl. For the whole voyage from Rotterdam to Kehl, the 
following are the calculations of the times and distances : 
From Rotterdam to Cologne, 
37h. 
30m. 
59 leagues *. 
Cologne to Coblentz, 
14 
10 
19 
Coblentz to Mayence, 
13 
53 
21 
Mayence to Manheim, 
11 
21 
16 
Manheim to Schroeck, 
11 
24 
14 
Schrock to Fort-Louis, 
12 
23 
10 
Fort-Louis to Kehl, 
11 
4 
9 
111 
45 
148 
26. Method of' using pure Muriate and Sulphate of Soda , 
in the Manufacture of Glass , by M. Leguay . — Muriate of soda 
and sulphate of soda, may be employed, and at times with ad- 
vantage, in glass-making. A casting is readily obtained of very 
fine glass, having, when about three or four lines in thickness, a 
very slight green tinge. Its composition is as follows: decrepitated 
muriate of soda, 100 parts ; slaked lime, 100 ; sand, 140 ; clip- 
pings of glass, of the same quality, from 50 parts to 200. Sul- 
phate of soda likewise offers a great economy %i its employment. 
The results are very satisfactory. The glasses made with this 
salt were of a very fine quality. The following is the composi 
* Leagues of 25 to a degree. 
