CLAYS OF MIDDLESEX COUNTY. 441 



It burned steel-hard at cone 5 and warped but little. The ma- 

 terial was barely incipiently fused at cone 27 and fused above 

 cone 34. Its analysis was very similar to that of the preceding 

 sample from locality 14, and was as follows : 



Analysis of No. i fire clay. Anness & Potter, Woodbridge. 



Raw. Burned. 



Silica (Si0 2 ) , 5156 59-CO 



Alumina (Al-Os), 33-13 37-91 



Ferric oxide (Fe20 3 ), 0.78 0.89 



Titanic oxide (Ti0 2 ), 1.91 2.19 



Lime ( CaO ) , tr .... 



Magnesia (MgO), tr .... 



Alkalies (Na 2 0, KsO), tr 



Loss on ignition, 12.50 .... 



99-88 99.99 



The percentage of titanium is slightly higher. 

 Refractory tests alone were made of some other samples with 

 the following results : 



Fusion tests on highly refractory clays. 

 Locality. Owner. Material. Cone. 



No. 9 Woodbridge, .Dixon Bank, Buff clay, 33 vitrified. 



No. 21 do. P. J. Ryan, Fine fire clay, 34+viscous. 



No. 90 Bonhamtown, J. Pfeiffer, Black fire clay, 33-l-viscous. 



No. 61 Burt Creek,. .Sayre & Fisher Co., Clay from old Cream 



Ridge bank, 32 vitrified. 



No. 69 Sayreville, ...Whitehead Bros., .Sandy clay, Whitehead's 



sandpit, 33+viscous. 



In respect to their refractoriness, all the above compare well 

 with the best clays tested in this country, 1 as can be seen from the 

 following table : 



Refractoriness of fire clays from other States. 



Locality. Cone. 



Mt. Savage, Md. (flint clay) , 34-35 



Mineral Point, Ohio, 33 



Golden, Col., 32-31 



Sayreville, N. J., 35 



1 Bull. N. Y. State Museum, No. 35, p. 783. 



