83 



TAB. CCCXLVL 



C A L X carbonata. 

 Incr listing Carbonate of Lime. Osteocolla. 



Div. 2. Imitative. 



Syn. Osteocolla. Enc. Brit. 



Chaux carbonatee incrustante. Haily, 2. 172, 



Osteocolla being mentioned in most modern books, it 

 may naturally be inquired for in mine : and as I should hope 

 not to be wanting where there may be information given, I 

 herewith exhibit a figure of this substance, which is more 

 than ordinarily instructive, although only a variety of Sta- 

 lagmite. The present specimen was found near Shotover 

 Hill, and shows the curious mode of its accumulation, 

 especially as the substance of the branches is yet distinct. 

 It is called Osteocolla from being supposed to have a power 

 of uniting broken bones. It may vary with the nature of 

 the current that deposits it. This specimen has a peculiarly 

 soft and chalky, somewhat woolly, appearance. It is 

 nearly of the same nature as the deposit in a tea-kettle; 

 but that is harder, and may give an idea that it depended 

 on the water being heated. We find these depositions to 

 be generally about this hardness, or perhaps a little harder 

 and rather more compact. Westminster Bridge has a settling 

 of the Lime from the water on some parts of its sides of 

 a curious undulating figure ; and moss with many other 

 subjects, such as birds-nests with the eggs, are covered in a 

 similar manner at Matlock and Knaresborough, first settlings 



h 2 



