GREENLEY ISLAND. 249 



Upon the island is an occasional outcropping, apparently of this 

 same rock, though for the most part the ground is soft grassy and 

 mossy muck, with occasional fresh water ponds. Here and there 

 are strewn angular blocks of coarse, poor, grayish-yellow granite, 

 quite different from the predominant rocks on the island. These 

 are more or less square in outline and varying in size from two to 

 five feet. The tops are flat, and the edges all clean cut, and hardly 

 if at all water- worn, being distinct from the worn edges of the bowl- 

 ders, which were common near to the water's edge. These blocks I 

 have mentioned are scattered at irregular distances all over the 

 southwest portion of the island, being more abundant near the table 

 rock before mentioned, and west of the lighthouse. All the beach 

 on that side of the island which faces Wood Island is sand, while 

 the high point here seaward is mostly of the same origin so far as I 

 could ascertain. 



The lighthouse is situated on the southern extremity of the island. 

 It is an octagonal wooden structure, marked like stone or brick, and 

 painted white upon the outside. The apparatus for illumination 

 consists of an iron framework fastened to an upright revolving rod, 

 that moves by a simple arrangement of wheels ; one of these is 

 heavily weighted while a handle is furnished for winding the weight 

 and keeping the apparatus in motion. Another small upright rod 

 with an upright screw attached keeps in motion a patent governor, 

 for regulating the time of each revolution. This governor is a 

 crossbar, on each end of which is a sort of fan, of brass, which 

 turns in a perpendicular or horizontal direction to indicate slow or 

 fast. Ordinarily the governor turns one hundred and twenty times 

 in a minute, and the lamps are four minutes in making a complete 

 revolution. The speed is regulated by government authority. The 

 top of the tower has twelve large, double plate glass windows, each 

 a quarter of an inch thick. The lights are twelve, arranged to shine 

 as four, three being white and one red, which flash as they revolve 

 at given intervals far out to sea, warning the sailors that the coast 

 is nigh. 



We were very cordially received and shown around by the light- 



