Botany and Zoology* L61 



parish, Sweden. JFkrrosUbian is found imbedded in rhodonite in 

 well developed monoolinic crystals. The color is black to black- 

 ish-grav, the streak brown, the luster subnietallie, the hardness 4; 

 it is weakly magnetic An analysis gave 



Bb.O, FeO ^ KnO BtO 



nsu 22*60 16-91 1034 Mg a CO s , CaC0 3 2.H, insol. 2'24=*99'09 



Pleurastte from the same locality is regarded as an arseniate of 

 iron ami manganese containing chlorine. It has a blue-black 

 color, subnietallie luster, a conchoid al fracture, and hardness of 4. 

 No analysis is given, the assumed composition being based upon 

 some blow-pipe and other qualitative tests. Stibiatil is another 

 imperfectly studied mineral, regarded as a hydrous antimoniate 

 of manganese and iron, associated with polyarsenite (sarkinite). 

 It occurs in crystals, referred to the monoclinic system, and is 

 black and opaque with metallic luster and has a hardness of 4. 



Epigenitk. — A hydrous silicate of manganese and magnesium 

 occurring in brownish red bladed masses imbedded in tephroite. 

 An analysis gave 



SiO, MnO MgO FeO H 2 



29-50 40-G0 20-05 tr. 9-85 = 100- 



The formula deduced is R Q Si0 4 + H 2 which places it near the 

 hydrotephroite of the same author. The same name has been 

 used before for a mineral related to enargite. — Geol. Fbrening i 

 Stockholm Forhandl, xi, 389, 1889. 



11. Native Arsenic from Colorado. — Mr. Clarence Hersey 

 has announced the discovery of native arsenic in a mine yielding 

 silver and some gold, five or six miles west of Leadville, Colo- 

 rado. The mineral occurs in nodular concretionary forms so 

 brittle that they readily break to fragments. 



12. Catalogue of Minerals found in JVeic Jersey, by F. A. Can- 

 field, 23 pp. Trenton, N. J. 1888. — From the final report of 

 the State Geologist, vol. ii. This well prepared list will be use- 

 ful to all interested in the local mineralogy of New Jersey. 



III. Botany and Zoology. 



1. Hybrids. — G. de Saporta (Comptes rendus, Oct. 28, 1889) 

 gives an interesting account of certain hybrids observed in 

 Provence. These are (1) Pinns halepensis-pinaster, the mother- 

 plant being assumed to be P. pinaster, and the father, P. hale- 

 pensis. The hybrid has the port of the, mother but with less 

 regularity of branching, and having the grayish bark scaling oft 

 in large flakes. The leaves, so far as their size is concerned, are 

 just between the two. (2.) Quercus pubescente-Mirbeckii. The 

 hybrid is exactly intermediate betw T een the two parents. The 

 mother, Q. Mirbeckii, is from Africa. (3.) Tilia platyphyllo- 

 argentea has hybrids of all ages, showing that the fertilization is 

 not, by any means, confined to any particular year. 



It is noteworthy that of the species mentioned above, two are 

 monoecious, and one hermaphrodite. g. l. g. 



