456° | General Notes. [ May, _ 
recently examined! a rock from the left bank of the Jamma, a 
tributary of the Blue Nile. This rock consists of the remains of 
orthoclase of the first generation in a groundmass of secondary 
quartz with little crystals of nepheline, orthoclase and amphibole, 
It is, according to Lévy, a type of rock between the tephrites and 
the phonolites, In the same journal Lacroix has a note? on 
the basaltic rocks of County Antrim, Ireland. These are labra- 
dor basalts with a typical ophitic structure. They contain the 
following minerals in the order of their crystallization : apatite, 
magnetite, olivine, labradorite and pyroxene in lathe-shaped crys- 
tals, palagonite, hematite, chlorite and zeolites. The zeolites are 
in the cavities of the rock. A search was made for the native 
iron mentioned by Andrews as occurring in these rocks, but 
none was found. Four additional parts of the “ Erlauterungen 
zur geologischen Specialkarte des Königreichs Sachsen ”? have 
just been published. The sections described are Oschatz-Miigela 
by Th. Siegert, Falkenstein by Schröder, Wurzen by Schalch and 
‘Averbach-Lengenfeld by Dalmer. These authors describe the | 
Eibenstock tourmaline granite, the Kirchberg granitite and the | 
slates and sandstones metamorphosed by them. 
MIscELLANEous.—The Denison University of Granville, Ohio, 
has just issued, in its Bulletin of the Laboratories of Denison 
University, a compendium of petrographical manipulation by C. 
L. Herrick. The first part is a condensation of the theoretical 
part of Hussak’s book, in which many of the errors of the orig- 
inal have been rectified. The methods in use for the preparation 
and examination of rock section are described as clearly as might 
be expected in a treatise of such small size. Unfortunately a few 
mistakes still remain to confuse the student who attempts to make 
ioe use of this little work without the aid of an instructor to explain 
~ — away his difficulties. Most of these errors, however, seem to be 
[iia Ree ee 
ENFER 
phlet of Mr. Herrick’s will prove of great value to students 
desire merely to gain some insight into the methods so gene 
nade use of at present in the study of rocks. 
BOTANY.‘ 
CARBONACEOUS RESERVE Foop-MATERIALS IN Funot.—M. i 
_ Errera points out in the Comptes Rendus of the French i 3 
~ emy of Sciences a close analogy in this respect between tungt — 
and flowering plants. In the seeds, tubers, &c., of Phanerogam> — 
rally 
_ 1 Comptes Rendus, cit, No. 8, p. 451. 
7Ib., 454. 
_ §Cf. AMERICAN NATURALIST, April, 1886, p. 374. 
_ Edited by Professor CHARLES É, Bessry, Lincoln, Nebraska. 
