370 Ivory Paper. — Mawufaciure of Glass. 



3. Lithographic Paper. 



Count Lasteryrie has reported to the Society D'En- 

 couragement of Paris (under date of June 28th, 1820) in 

 favour of the Lithographic paper or cards, invented by 

 Senefelder. The card is covered on one or both of its fa- 

 ces, with an argillo-calcareous mixture, which has the prop- 

 erty of receiving the ink or the crayon and of undergoing 

 the ordinary preparation and furnishing proofs as neat and 

 perfect as those obtained from designs traced on stone. 

 Common writing is easily transferred to the hthographic 

 or papyrographic plate and copies of it taken. The Persian 

 ambassador being present with the commissioners at their 

 examination of the press, wrote in Arabic a note, of which 

 copies were taken. The translation is as follows : 



Mirza Moul Hassan Kham, ambassador extraordinary 

 from the illustrious court of Persia, residing in the delightful 

 city of Paris, the 24th May, 1820 of the christian era came 

 to see the papyrographic press which has been invented in 

 France, and which offers greater facilities than any other. 

 All that I have seen in Paris, either with respect to the cli- 

 mate or to objects of art, surpasses all that I have seen in 

 other countries." 



4. Ivory Paper. 



A Mr. Einsle of London has invented what he calls Ivory 

 Paper which is found in regard to hardness, smoothness and 

 whiteness, to answer as well as ivory in the hands of minia- 

 ture painters. A premium of thirty guineas has been assign- 

 ed to the inventor by the Adelphi Society in London. 



5. Manufacture of Glass. 



M. Westrumb has found that the salts of potash and so- 

 da deprived of their water of cryslalization answer as well 

 as the pure alkali itself in the fabrication of glass. Muriate 

 of soda, sulphate of potash, and particularly sulphate of so- 

 da, contain much water. The latter loses fifty eight per 

 cent by drying. Twenty four parts of sulphate of soda are 

 thoroughly dried and mixed with eight parts of powdered 

 charcoal and sixteen of good white sand. The mixture is 



