912 NEW YORK STATE MUSEUM 



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■ Clays of ]S[©w Jersey. Ibid. 1879. 6: 177& (a). 



Spencer, J. W. Clays of Georgia. Ga. geol. snr. 1893. 

 p. 276 (a). 



Struihers, J. Le Cijatelier thermoelectric pyrometer. School 

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Yogt, G. La porcelaine. 1893. 



Wheeler, H. A. Eusibility of clays, Eng. and min. jour. 1894. 

 17: 224 (&). 



Vitrified paving brick. Indianapolis 1895. 



' Clays of Missouri. Mo. geol. sur. 11: 1896. 



Young, J. J. The ceramic arts. 'New York 1878 (b). 



Zwick, 0. Die Ziegel Industrie. Leipzig 1894. 



