No. 398.] REVIEWS OF RECENT LITERATURE. 161 
of a nepheline-basalt gave in one case a nepheline-basalt and in two 
other cases limburgites. 
In order that the best results may be reached the author declares 
that specially prepared apparatus is necessary, but with a proper 
equipment he believes that much might be learned concerning the 
method of origin of the different types of igneous rocks by simple 
fusion experiments. 
Notes. — The dikes cutting the mica-gneisses in the vicinity of 
Johns Bay, Maine, are similar in all essential respects to those near 
Portland in the same state. Miss Bascom? reports that two are 
olivine diabases, and a third is nonolivinitic. 
Gratacap issues a plea? for a more interesting display of rocks in 
museums than that one usually sees. He also suggests along what 
lines such a display might be constructed to be at the same time of 
interest and of value. 
Judd? describes under the name of rockallite the peculiar rock of 
Rockall Island in the Atlantic, 240 miles west of Ireland. The rock 
consists of zgirite, quartz, and albite in the proportions 39 : 38 : 23. 
The albite is sometimes porphyritic. An analysis gives : 
SiO; AlOs Fe90; MnO NiO MgO CaO KO PO; Total 
neos 4 1310. o 6 üt 37 696 = 99.83 
The structure is granitic. Its systematic place is in the granite 
group, although its feldspar is solely albite. 
The rocks gathered by the International Boundary Commission 
along the newly surveyed boundary line between the United States 
and Mexico are granites, gabbro-diorites, diabases, diorite, porphy- 
ries, rhyolites, andesites, and basalts One of the rhyolites is 
Spherulitic. 
The collection of rocks made by Alexander Agassiz in the Fiji 
Islands contains specimens of granite, andesites, and basalts. 
Eakle* describes augite-andesite as the predominant rock of the 
islands. It varies from a very feldspathic type to a very basic type 
that appears to grade into basalt. In addition to this andesite there 
are also present hypersthenic and hornblendic varieties. 
! Amer. Geol. (1899), vol. xxiii, p. 275. 
2 Ibid., p. 281. 
* Trans. pus Trish Acad., vol. xxxi, Pt. iii, p. 39. 
* Lord, E. C. E. Proc. U. S. Nat. Mus., vol. xxi, 1899, p. 773. 
5 Proc. Amer. Acad. Arts and Sci., vol. xxxiv (1899), p. 581. ` 
