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34 



RECENT RAIN-PRINTS. 



[Ch. XV. 



exam 



were sent to me by Dr. Webster, from Kentville, on the borders 



They were made by a 



Nova 



heavy shower, which fell on the 21st of July, 1849, when the 

 rise and fall of the tides were at their maximum. The 



im- 



pressions (see fig. 10) consist of cup-shaped or hemisphe- 

 rical cavities, the average size of which is from one-eighth to 

 one-tenth of an inch across, but the largest are fully half an 

 inch in diameter, and one -tenth of an inch deep. The depth 



is chiefly below the general surface or plane of stratification, 



but the walls of the cavity consist partly of a prominent rim 

 of sandy mud, formed of the matter which has been forcibly 

 expelled from the pit. All the cavities having an oval form are 

 deeper at one end, where they have also a higher rim, and all 



Pig. 16. 



Recent rain-prints, formed July 21, 1819, at Kentville, Bay of Fundy, Nova Scotia. 



The arrow represents the direction of the shower. 



the deep ends have the same direction, showing towards which 

 quarter the wind was blowing. w Two or more drops are some- 

 times seen to have interfered with each other ; in which case 

 it is usually possible to determine which drop fell last, its rim 

 being unbroken. 



On some of the specimens the winding tubular tracks of 

 worms are seen, which have been bored just beneath the sur- 

 face (see fig. 16, leftside). They occasionally pass under the 







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