April 6, 18S3.] 



SCIENCE. 



245 



lators. Improved processes of manufacture 

 have in a great measure removed these defects, 

 but even the best lights will still occasionallj' 

 flicker. 



The red and yellow raj's have the greatest 

 penetrating power ; and for this reason an oil- 

 light, which is rich in these raj's, can be seen 

 farther in foggy weather than an electric light 

 of equal candle-power. But the electric light 

 can be made so much more powerful than the 

 best oil-light, that this deficiency' can be more 

 than made up ; still, it must be borne in mind 

 when the caudle-powers of the two lights are 

 compared. 



When the French system was adopted, the 

 incandescent electric light had not left the 

 domain of experiment ; and even now its lu- 

 minous intensity is verj' much less than that 

 which can readily be obtained from an arc-light 

 of moderate dimensions. It possesses, how- 

 ever, the element of remarkable flxitj^ and is 

 rich in red and yellow rays. No liglit could 

 be better for a light-house, if it can be produced 

 cheaply, have sufficient luminous intensit}', and 

 be made reliable. It will, moreover, dispense 

 with the somewhat complicated and expensive 

 regulators. 



It is in this line that the Light-house board 

 of the United States is about to make experi- 

 ments, and the results obtained will have great 

 interest for the whole world. 



David Porter Heap. 



GEOLOGICAL NOMENCLATURE AND 

 COLORING. 



The following stratigraphical divisions have 

 been provisionally adopted by the international 

 commission of the geological map of Europe. 

 The colors placed against them are those pro- 

 posed by the director's. 



1. Gneiss and protogine. Bright rose-red. 



2. Crj'stalline schists (mica scliists, talc and 



chlorite schists, amphibole schists, and 

 foliated gneiss). Medium rose-red. 



3. Phj'llites (argillaceous schists, urthon- 



schiefer). Pale rose-red. 



4. Cambrian (all fossiliferous beds below the 



Llandeilo flags ; pi'imordial fauna, Ta- 

 conic) . Reddish graj-. 



5. Silurian, lower fauna (second of Barrande) . 



Dark silk-greeu. 



6. Silurian, upper fauna (third of Barrande). 



Light silk-green. 



7. Devonian, lower. Dark green-brown. 



8. Devonian, middle (limestone of the Eifel). 



Medium green-brown. 



9. Devonian, upper. Light green-brown. 



10. Carboniferous, lower (culm, mountain 



limestone, etc.). Blue-gray. 



11. Carboniferous, upper (houillier, millstone- 



grit, etc.). Graj'. 

 1'2. Permian (dj'as), lower (rothliegendes, 

 etc.). IBurnt sienna. 



13. Permian (dyas) , upper (zechstein and 



equivalents) . Sepia. 



14. Trias, lower (gr6s bigarr^). Dark violet. 



15. Trias, middle (muschelkalk) . Medium 



violet. 



16. Trias, upper (keuper and equivalents). 



Light violet. 

 16'. Rhetic, provisionally (haupdolomit ex- 

 cluded) . 



17. Jurassic, lower (lias). Dark blue. 



IS. Jurassic, middle (dogger, kellovien in- 

 cluded). Medium blue. 



19. Jurassic, upper (malm with tithonic and 



Purbeck) . Light blue. 



20. Cretaceous, lower (Neocomicn and Weal- 



diau) . Dark green. 

 20'. Gault, provisionally. 



21. Cretaceous, upper (from the cenomanien). 



Light green. 



22. Eocene (nummulitic, etc.). Orange-yel- 



low. 

 22'. Flyscli^ provisionally. 



23. Ohgocene (with the aquitanien). Dark 



yellow. 



24. Miocene (mollasse). Medium yellow. 



25. Pliocene. Light j'ellow. 



26. Diluvium. Naples j-ellow. 



27. Alluvium. White. 



The subdivisions, ' Rhetic,' ' Gault,' and 

 'Flysch,' whose affinities are doubtful, will 

 be figured separately' in the preparatory work ; 

 so that they can finally be joined either to 

 the upper or lower formation, according to the 

 decision reached hy the commission of nomen- 

 clatave. 



INDIAN RELICS FROM NEW BRUNS- 

 WICK. 



TuoTJGH Indian relics of the ordinary type, such 

 as arrow-heads, axes, gouges, celts, etc., are of common 

 occurrence in this region, as elsewhere, it is CKtremely 

 rare to find any articles showing other features than 

 those of mere utility ; wliile remains of pottery, so far 

 as I am aware, have, until recently, been entirely un- 

 known. During the last summer, however, my atten- 

 tion was directed to a locality whicli is one of some 

 interest, not only as containing undoubted relioa of 

 this cliaracter, but also as illustrating a somewhat un- 

 usual mode of occurrence. 



The locality in question is that of a small stream or 

 'thorough fare 'connecting two sheets of water known 

 as Grand and Maquapit Lakes, being the two principal 

 members of a series of lal<es and streams covering a 

 considerable area in the central coal-basin of New 

 Brunswick, and tributary to the river St. John. Both 



