Report on the projected Survey of the State of Maryland. II 



ry slight deviations along the main'post road to Baltimore, nearly the 

 whole of the site of which it embraces ; thence along the line of the 

 Baltimore and Ohio Rail Road, to where it reaches the Patapsco; 

 from this a little west of the Washington turnpike road, passing behind 

 that city and terminating at the confluence of Rock creek and the 

 Potomac, it will form the N., N. W., and W. boundaries of the por- 

 tion of Maryland, on the western side of the Chesapeake bay, in 

 which these cloy deposites, varying in extent, in nature, and conse- 

 quently in their susceptibility of application to useful purposes, will 

 be found to occur. 



The value of these deposites is already fully appreciated by those 

 engaged in the manufacture of their contents. The stone ware of 

 Baltimore is celebrated and largely exported. The clay of which it 

 is made, is sent in great quantities to Philadelphia. The Baltimore 

 glazed ware, yellow and black, is a highly prized article of commer- 

 cial exchange. Our common pottery is no less extensively used. 

 An estimate of fifty thousand dollars rather falls short of than ex- 

 ceeds the annual value of products in this branch of domestic indus- 

 try ; of which from fifteen to twenty thousand dollars worth is yearly 

 exported.* The common bricks, and the pressed bricks of Baltimore 

 which are the best made in the U. States, are likewise products of 

 the domestic industry of Maryland of great value as articles of export. 

 The^re bricks, which, so far as regards the U. States, are made exclu- 

 sively at Baltimore, have been pronounced by competent judges, after 

 repeated trials, to be fully equal, if not superior to the far famed Stour- 

 bridge bricks of the same nature. Puddling clays too, of an excel- 

 lent quality, occur in several localities around Baltimore. Our man- 

 ufacturing industry calls now for the discovery of those varieties of 

 fine soft clay, which are used as substitutes for whiting in the manu- 

 facture of paper hangings, and of that purest variety of potter's clay, 

 called pipe clay, which is used for the pots of glass houses, and is 

 largely imported from Germany to be sent in great quantities to the 

 west. Surely, where nearly all the other known varieties of clay 

 are already found to exist, it may reasonably be expected that the 

 research after the only ones of value remaining to be discovered will 

 be crowned with success. 



» No account is taken in this place of the porcelain clay, which there is reason 

 to believe occurs in abundance, in the upper parts borh of Cecil and Harford coun- 

 ties, because this mineral belongs to another order of geological formations. 



