20 POSSIBLE OSCILLATION OF LEVELS OF LAND AND SEA. 



that there seems to be less depth of water over certain well- 

 known rocks near the islands than formerly. This, however, if 

 true, does not seem to have been a sudden change, but rather a 

 slow elevating movement possibly still going on. As it is of 

 the greatest importance to get more definite information with 

 regard to this locality, I have already taken some steps to fix 

 a tide mark on Minders Island, so that in future years obser- 

 vations may be made upon some certain data that we at present 

 possess. 



It would be desirable also in the interest of Navigation to 

 have such marks carefully made on various parts of our coast 

 line. 



It might be of value, therefore, if this important matter 

 received the attention of the Members of this Society. 



