172 Foreign Literature and Science. 



"5 



young shoots of the bamboo ; that of the Northern provinces 

 of the inner bark of a tree called ku-tschu which is no more 

 than the paper mulberry, {moms papyrifera.) It is this pa- 

 per which is most commonly employed in China. They re- 

 sort to chemical solvents, and especially the ley of ashes to 

 bring it to a soft pulp, or paste, and they make use of rice 

 water and other infusions to render it properly consistent and 

 sufficiently smooth and white. — Bull oVEncour. Juil. 1826. 



1 6. Useful Alloy. — M. Frick in melting together 50 parts of 

 copper, 31.20 of zinc, and 18.75 of nickel, obtained a metal- 

 lic alloy, white, not oxidable, very ductile, and which acquires 

 a beautiful polish ; in varying these proportions, viz. by taking 

 53.39 of copper, 29.13 of zinc, and 17.48 of nickel, he pro- 

 duced an alloy which has the sound and unchangeable nature 

 of silver, but harder. It is particularly suitable for ornaments, 

 objects of saddlery, boxes, watch chains, &c. This alloy 

 was sold at first at 1 2 francs per pound, but as nickel is suffi- 

 ciently abundant in Germany, and as many artists are enga- 

 ged in this composition the price will necessarily fall. — Idem. 



17. Micrometrical observations on Saturn, Jupiter and his 

 Satellites, made at Dorpat, with the large Achromatic Tele- 

 scope of Fraunhofer, by Prof. Struve. — After having reduced 

 the measures relative to Saturn and his double ring, to the 

 mean distance of that planet, M. Struve obtained the follow- 

 in g values in seconds of a degree, and thousands of a second. 



Exterior diameter of the exterior ring, seconds, 40.21 5 



Interior diameter, - -..-.- - 35.395 



Exterior diameter of the interior ring, - 34.579 



Interior diameter, - - - ■ - - 26.748 



Equatorial diameter of Saturn, - - 18.045 



Width of the exterior ring, - - - 2.410 



interior, ... - 3.915 



Interval between the two rings, - - 0.408 



Interval between the planet and ring, - 4.352 



Professor Struve adds, " I have perceived no other traces 

 of any other subdivisions of the ring. It is surprising that 

 the exterior ring should be sensibly less luminous than the in- 

 terior. 



"The fourth satellite presents a small disk, whose diameter 

 has nearly £ of a second. I have several times seen the 6th 



