140 TRANSACTIONS OF THE [FEB. 19, 
“The Advantages of standard or society Sizes for the Draw- 
ers, Trays and Boxes of Cabinets for Minerals and Microscop- 
ical Specimens ;” “On a portable Mineral Cabinet ;” ‘“ On Trays 
for Cabinets, moulded from aluminum, celluloid, papiermaché or 
wood-pulp,” by W. G. Levison. 
An orbicular Granite from Quonochontogue Beach, 
Rhode Island. 
By Jd: fF. Kreme: 
(Puate IT.) 
For many years it has been known that granite occasionally 
displays a very peculiar spheroidal structure, which is called 
“orbicular granite,” “ ball granite” and “spheroidal granite ” 
in English, ‘and “ Kugel- eranit ” in German. Such have been 
recorded from various places abroad, but are especially well 
known from Swedish and Sardinian localities. Almost all mu- 
seums contain also the related phase of diorite, known as cor- 
site and napoleonite, that comes from Corsica. Allied phe- 
nomena have already been four times reported in America. In 
1861 uae Kdw. Hitchcock* recorded the well known ‘ pud- 
ding ” or “ prune” granite of Craftsbury, Vt., and it was, after- 
eae in 1878, described with microscopic sections by G.W: 
Hawe es,t and again by de Chroustchoff in 1885.{ The nodules 
seem to the eye to be entirely formed of biotite, in concentric 
layers, but under the microscope it is seen that much quartz oc- 
curs between the laminae, that muscovite occasionally appears, 
and that there is faint suggestion of a core. G. P. Merrill§ has 
also recorded in a number of Maine granites, employed for 
building purposes, various dark sevregations that mar the 
stone. "They are both angular and rounded, and in most cases 
show no sharp line of demarcation from the matrix. They 
manifest no tendency to separate from the granite when broken. 
While in mineralogical composition they are much the same as 
the nodules described here, the paper of Mr. Merrill does not 
indicate the beautiful concentric and radiating structures of the 
Rhode Island example as being preseut in the specimens yet 
met in Maine. 
* ‘ Geol. of Ver mont, Il. 564, 1861. 
+ Geol. of New Harmipenine! III. Part 4, p. 208, and Pl. XI. Fig. 4, 1878 
t Bull. Soc. Min. de France, VIII. 137, 1885. 
§ On the black Nodules or so-called Inclusions in the Maine Granites. Proce. 
U.s. National Museum, 1888, 137 
