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posite Monroe. But few were made the past season. During the 

 season previous, so far as could be ascertained, about 1,600,000 were 

 burned at the several kilns. The clay is impure from the lime con- 

 tained. 



A single kiln of bricks has been burned at Brest. 



At Mr. White's yard, Newport, 100,000 bricks have been burned. 

 The first two feet of the clay, only, is sufiiciently free from calcareous 

 matter to render it fit for the purpose. 



Attempts were made at two places, in the town of Dundee, to man- 

 ufacture bricks, but were abandoned from the cause alluded to. Good 

 bricks are said, nevertheless, to have been made from the clay on Sa- 

 line river, in the town of London. All the clays in this region, that 

 were tested, gave very strong indications of lime, so much so as to de- 

 serve the appellation of marly. As the clays, even in proximate situa- 

 tions, often differ much in this respect, it is important to test them with a 

 simple acid. Good vinegar will answer an ordinary purpose. Clay 

 may, no doubt, be found considerably pure ; besides that expense and 

 disappointment may often be spared by a previous knowledge of the 

 character of the material employed. 



MARL. 



A bed of shell marl (hog Urn,) underlies the marshy tract bordering 

 the Lake, near the city of Monroe. It has been penetrated to the depth 

 of a foot by ditches, for a considerable distance. The deposit has prob- 

 ably a thickness of several feet, and apparently underlies the whole 

 continuous tract of marih, an extent of about a square mile. 



A tufaceous marl is also deposited in considerable quantities by 

 springs in the vicinity. 



In town of Exeter, section 7, a marl is said to have been plowed up, 

 dry, and crumbling on exposure. 



A deposit of shell marl was observed in town of Ash, (town 6 south, 

 range 9 east,) section 9. It occurs in a marshy swale, overlaid by 2 

 feet of muck or peat. The bed is about a foot in thickness, and occu- 

 pies an area of an acre. Similar swales are numerous throughout this 

 section, as well as in other parts of the county, and the proximity of 

 the limerock warrants the conclusion that beds of marl may be found 

 deposited on low spots, charged with springs. 



The economical use of these marls has been noticed under the report 



