INGENUITY AND LUXURY 



(pp. 209-212.) The Construction of a Concrete Building. The 

 quotation is from The Scientific American, Feb. 15, 1908, pp. 109- 

 no. 



CHAPTER X 



THE PRODUCTS OF CLAY AND FIRE 



Much valuable information for this chapter has been obtained 

 from "Notes on the Manufacture of Earthenware," by Ernest 

 Albert Sandeman, London, 1901, and quotations on pp. 239 and 

 249-251 are from that work. 



CHAPTER XI 



GLASS AND GLASS-MAKING 



(p. 283.) Glass a luxury in the Middle Ages and in the Early 

 Modern Period. The quotation is from "Wonders of Glass- 

 Making in all Ages," by Alexandre Sauzey, New York, 1875. 



(pp. 284-285.) The Composition of Glass. The quotation is 

 from "La Manufacture de St. Gobain," by M. A. Cochin. 



CHAPTER XII 



GEMS, NATURAL AND ARTIFICIAL 







(pp. 306-309.) Diamond-Cutting. The quotation is from 

 "The Gem-Cutter's Craft," by Leopold Claremont, London, 

 1906, pp. 40-46, from which work information of great value has 

 been derived for other portions of this chapter. 



[336] 



226 



