be 
On the Heights of the Tides of the Atlantic Coast. 47 
of ammonia being evolved. This appears to have been over- 
looked by the above cited observers, but the fact can be easily 
proved by adapting an abduction tube to a flask containing a 
ART. VI—On the Heights of the Tides of the Atlantic Coast of the 
United States, from observations in the Coast Survey; by A. D. 
Bacux, Superintendent.—With a Plate. 
{Communicated by authority of the Treasury Department to the American Associa- 
tion br the Advancement of Science. 
been enabled to extend these results to the coasts of New Bruns- 
wick, Nova Scotia, and to part of Newfoundland. 
