244 



Classification of Natural Silicates. 



Lossier. No less than from 2.13 grains to 2.44 per gallon of 

 these inorganic substances were found in solution in the waters 

 of these lakes. * 



VIII. The Classification of Natural Silicates. 



By T. Sterry Hunt. 



On pages 129 to 135 of the Record appears an abstract of a 

 System of Classification of Natural Silicates, set forth by the writer 

 in an extended essay " On a Natural System in Mineralogy, with 

 a Classification of Silicates, " presented to the National Academy 

 of Sciences at Washington, in April, and to the Royal Society of 

 Canada at Ottawa in May, 1885, and now in process of publication 

 in the third volume of the Transr ctions of the latter. Accompany- 

 ing the abstract, as printed in the Record, are three synoptical 

 tables, which were but tentative, and, as the reader will have seen, 

 not only incomplete but, as regards that of the Persilicates, in con- 

 flict with the text. These tables having been inserted in the 

 abstract by an error, the present revised ones are given, which will 

 shew more fully the system proposed. 



Synopsis of the Order SILICATE. 



Sub- 

 order . 



I. Protosilicate. 



II. Protopersilicate. 



III. Persilicate. 



Tribe. 



1. Hydroprotospatboid 

 (Pectolitoid) 



6. Hydroprotoperspatboid 

 (Zeolitoid) . 



11. Hydropers- 

 patboid. 



Tribe. 



2. Protospatboid 



7. Protoperspathoid 



12. Perspatboid. 



Tribe. 



3. Protadamantoid.... 



8. Protoperadamantoid... 



13. Peradaman 

 toid. 



Tribe. 



4. Protopbylloid 



9. Pr otoperpbylloid 



14. Perpbylloid. 



Tribe. 



5. Protocolloid 



(Opbitoid) 



10. Protopercolloid 



(Pinitoid) 



15. Percolloid 



(Argilloid) . 



* This paper was written in answer to a request for the Author'^ 

 observations on the diatom aceous deposits of Nova Scotia. It wa9 

 simply given as a report of the progress of the Author's own work, 

 which has since been extended to other portions of the Province, to New 

 Brunswick, and Newfoundland. " Silliman's Journal," April, 1845, 

 contains a list of twelve fossil infusoria determined by Professor 

 Bailey in material sent from Earlton Lake by Sir J. W. Dawson. Of 

 these, ten are now known as diatoms, and two as sponge spicules. 



