On Canadian Caverns, 185 



perforated, flower-pot, and pillared rocks, which have at one time 

 formed the boundaries or walls of caverns, and all of them unques- 

 tionably the result of aqueous action. The second comprises 

 caverns and subterranean passages which are situated on dry land, 

 and so far as we know, not attributable to the same causes in 

 their origin as the first, or at least not applied in the same manner. 



In the first class are included the followino; : — 



1. Caverns on the shores of the Mao:dalen Islands. 



2. Caverns and arched rocks at Perc^, Gaspe. 



3. Gothic arched recesses, Gaspe Bay. 



4. The '^ Old Woman," or flower-pot rock, at Cape Gaspe. 



5. Little River Caverns Bay, of Chaleur. 



6. Arched and flower-pot rocks of the Mingan Islands. 



7. Pillar sandstones, north coast of Gaspe. 



8. Niao^ara Caverns. 



9. Flower Pot Island, Lake Huron. 



10. Perforations and caverns of Michilimacinac, L. Huron. 



11. The Pictured Rocks, Lake Superior. 



12. St. Ignatius Caverns, Lake Superior. 



13. Pilasters of Mammelles, Lake Superior. 



14. Thunder Mountain and Pate Island Pilasters, L. Superior. 

 In the second class are : — 



15. The Steinhauer Cavern Labrador. 



16. The basaltic caverns of Henley Island. 

 1*7. Empty basaltic dykes of Mecattiaa. 



18. Bigsby's Cavern, Murray Bay. 



19. Bouchette's Cavern, Kildare. 



20. Gibb's Cavern, Montreal. 



21. Probable caverns at Chatham, on the Ottawa. 



22. Colquhoun's Cavern, Lanark. 



23. Quartz Cavern, Leeds. 



24. Probably caverns at Kingston, Lake Ontario. 



25. Mono Cavern. 



26. Eramosa Cavern. 



27. Cavern in the Bass Islands, Lake Erie. 



28. Subterranean passages in the Great Manitoulin Island, Lake 



Huron. 



29. Murray's Cavern and subterranean river, Ottawa. 



30. Probable caverns in Iron Island, Lake Nipissing. 



