133 



The asbestos of commerce comes from Canada and Italy, witlx 

 much, smaller supplies from some other districts. In Xew South. 

 Wales, a few tons of good material were procured at Jones 

 Creek, G-undagai, a few years ago : none has been procured 

 since, or elsewhere. 



Italian asbestos is characteristically long in fibre, while the 

 Canadian is comparatively short. In lode-case 128 will be found 

 a specimen illustrating well the mode of occurrence of asbestos 

 in Canada : a vein of it is seen traversing serpentine. 

 Commercial samples of Canadian asbestos are exhibited here, 

 ticketed with their values per ton in 1900. On the east wall is a 

 small case containing a variety of articles manufactured from 

 asbestos. 



Samples from Italy, Canada, Oregon and Wyoming, also from 

 Oundagai, Eockley, Tamworth, Burrowa, South Australia, 

 West Australia, and New Zealand. 



These have been referred to to some extent under corundum rjoeg 1 1Q 



and emerti (page 131). Garnet is also sometimes made use of 



^ . Abrasives, 



for this purpose. 



Pumice : Teneriffe, Messina, IN'ew Zealand. 



The frothy portions of lava-streams. The procuring and 

 preparation of pumice is an industry of considerable importance 

 in the Lipari Islands (Italy). The pumice is obtained from 

 galleries driven into the lava, and, after drying, is graded 

 according to size. Pumice is used principally for polishing 

 purposes. 



Tripoli * : a remarkable porous siliceous rock found in Missouri. 

 Owing to its porous nature, it is used as an absorbent as well 

 as for abrasive purposes. 



Tripolite (Kieselguhr, Diatom Earth), see page S6. 

 Xev/ Zealand, Victoria, (j-ermany. 



* Diatom Earth has also been known as "tripoli." The Tripoli of Missouri does not 

 consist of organic remains. 



