256 A SYSTEM OF 



a. With an apyrus or refractory clay, 



Argilld porcellaned. 



It is found under the ftratum of 



coal in the coal-mine at Boferup in 



Skone •, is of a loofe texture, but 



hardens, and is very refractory in the 



fire. 

 i. With common clay, Argilld communis 



from Burfwick in the ifland of Gott- 



land. 



2. With lime, Lapis arenaceus glutine cal- 

 careo ; refembles mortar made with 

 coarfe fand. 



a* Confiding of transparent and greenifli 

 grains of quartz and white limeftone ; 

 from the ifland Ifo, near Beckafkog 

 in Skone. 

 . b. Of no vifible particles, from France 

 and Livonia. This is of a loofe tex- 

 ture, and hardens in the air. 



3. With an unknown cement, Lapis are~ 

 naceus glutine incognito^ for/an argillaceo. 



a. Loofe, from Helfingberg in Skone. 



b. Harder, from Roilagen, Orfa, and 

 Kinnekulle. 



c. Compact, from Gefle in the province 

 of Geflrikeland, and the lake Malaren. 



d. Very hard, from Serna Fiell or Fells 

 in Dalarne ♦, it is alfo found in great 

 abundance in loofe flones at Guiiavs- 

 ftrom, and at Siliamfors in the parifh 

 of Mora in Dalarne. 



4. Cemented by the ruft or ochre of iron, 

 Lapis arenaceus ochrd mar lis congluiinatus. 

 Is found in form of loofe ftcnes at feveral 

 places, and ought perhaps to be reckoned 



among 



