1898.] 



NATURAL SCIENCES OF PHILADELPHIA. 



93 



Mountain, in Bucks County, Pennsylvania, which retain the metal- 

 lic sound when broken. 



The Little Ringers, as they are termed, are essentially the same 

 as those described above. The outcrop, thickly covered by trees, is 

 situated about a quarter of a mile east of the others, and may be an 

 indication of a separate neck of a crater. The outcrop appears 

 small because the trees have taken possession of the surroundings. 



There is probably more 

 of it than can be seen 

 at present. If not pre- 

 vented, the trees will 

 cover the Little Ringers 

 in the course of time as 

 certainly as nine-tenths 

 of the whole area of the 

 hill is now covered. 



Not far from the Rail- 

 way Station on the hill, 

 borings for water were 

 made without result. 

 Some of the rock frag- 

 ments brought to the 

 surface indicated a bed 

 of amygdaloid of a pale 

 grayish color; the thick- 

 ness of the bed was not 

 ascertained and is at 

 present unknown. 

 Specimens of amygda- 

 loid are found on the 

 surface, one of which 

 had the almond shaped 

 nodules of more than an 

 inch in length and protruding from the rock nearly half an inch. 

 An interesting specimen of amygdaloid with an uncommon fluidal 

 texture is represented by the figure 1. It gives a fair idea of the 

 specimen, the lighter shade above and the darker below being 

 sharply defined. The fluidal texture is usually observable only in 

 thin sections under the microscope, but in this case, we have it ma- 

 croscopically. When magnified the thin section showed a great 



Fig. 1. 

 Amygdaloid showing fluidal texture. 



