46 Ww. B Rogers on Rolin Rings of ir 
: 
and a Liquids . 
not have been less than eight or ten inches in length, six or 
eight broad, and from one to two inches thick. The ‘surfaces of: 
ture is conchoidal and highly lustrous. This is wit ont 
* doubt the best locality for obtaining cabinet specimens of allanite 
: yet known in the United States. 
The lanthanite at these localities is probably formed by the 
slow decomposition of allanite. The thin scales and the layers 
of crystals in the fissures of the iron ore and on the surface of 
allanite are, to all appearance, the result of the action of percola- 
ting ace-water. ‘The beautiful mass of lanthanite in the soil 
at Bethlehem may have resulted from the decomposition of - i 
_. isolated crystal or boulder of allanite, which mineral has 
_ found to be abundant in that region 
Art, XXXTII.—On the Formation of Rotating Rings by Air oll * 
: Liquids under certain conditions of discharge; by Prof. Wie 
_ >. Liam B, Rocers. 
_fr has long been a familiar fact that the oe a hop, 
tted hydro PHs with an mixture of 
an 
escapes by momentary puffs from a ‘steam-pi ‘ 
“smokers know, such revolving rings are ees meee 
ejecting the smoky breath in a peculiar manner from the oa 
Sy “Open ing of the 
contrivance duatsoied 3 in ont at will similarly Jehan, 
os water and other liquids, and in tracing them to the 
mech causes which give origin to the rin pel of air. 
s of experimenting rich t as well 
Soo 
he mechan- 
