80 Scientific Intelligence. 



12. Beitrdge zur JTenntniss der Flora der Vorwelt, Band II, 

 Die Carbon-Flora der Schatzlarer Schichten, von D. Stur. K. K. 

 Geol. Reichs. xi Band, I. Abtheilung. — With many lithographic 

 plates and 48 zincotpyes. A grand work. 



13. Physikalische Kry&tallograpliie und Einleitung in die 

 hrystallographische Senntniss der wichtigeren Substanzen von 

 Paul Geoth. Zweite umgearbeitete und vermehrte Auflage, 710 

 pp. 8vo. Leipzig, 1885, (Wrn. Engelmaun). — This is a work which 

 should be in the hands of every student not only of Mineralogy 

 but of Chemistry also. The author is one of the most successful 

 teachers in Germany, and his book is especially adapted, both in 

 fulness of explanation and clearness of style, for the use of stu- 

 dents. The new edition contains much new matter, more espe- 

 cially in regard to the description and use of the instruments 

 employed in investigating the form and physical properties of 

 crystallized substances. The chapter devoted to this subject 

 extends to 130 pages and is all that could be desired, whether as 

 regards the completeness of description or the abundance of illus- 

 trations. 



14. On the occurrence of native Silver in New Jersey / by 

 Nelson H. Dabton. (Communicated.) — The only locality in 

 which metallic silver has been found in New Jersey hitherto is 

 the Bridgewater copper mine, near Somerville, where it occasion- 

 ally occurs as minute linings or blotches on the cuprite. Rogers 

 called attention to this in his 1836 Report, in describing, for the 

 first time, the copper deposits in the Mesozoic rocks of the State. 

 Many of the copper ores from other parts of the formation have 

 yielded small amounts of silver by assay, as noted by Scha?ffer.* 

 Recently a small opening for copper ore has been made on the 

 Westlake property, near the old Schuyler mine in Hudson County, 

 and in cavities in the very rich chalcocite ore the writer found 

 some very fine specimens, with thread silver associated with 

 mammillary coatings of malachite. The ore occurs in. red sand- 

 rock, adjacent to a dike of the trap sheet of the Hackensack up- 

 land and interbedded with carbonaceous strata, seamed with veins 

 of anthracite of small size. These features I will describe in de- 

 tail, in a memoir soon to appear. 



The thread silver is easily identified, fusing readily to a bead, 

 soluble in HN0 3 , from which it precipitate as chloride with HC1. 

 The threads are from 3 mm to 8 mm in length, and very uniformly 

 about 4- mm in thickness ; they are thinly coated with malachite, 

 and when this is removed, are bright and crystalline in appearance; 

 their regularity is sometimes interrupted by slight local thicken- 

 ings, and the terminations are irregular and ragged. Several 

 endeavors were made to cut sections for microscopic study, but 

 without success. The threads are always separate from each 

 other, extending from the walls out into the cavity. Assays of the 

 average ore yielded about 812 per ton of silver and a trace of gold. 

 The pocket was cleaned entirely out and the ore sent to Bergen 

 Point, 



* Eng. and Mining Jour., xxxiii, p. 90, 1882. 



