122 PROCEEDINGS OF THE ACADEMY OF [1885. 



Vi t the presence of chromium and nickel in serpentine are 

 facts in favor of its eruptive origin. For very many serpentines 



arc derived from peridotite, as has been clearly shown by recent 

 work in microscopic lithology. Most peridotites, whether meteoric 

 or terrestrial, as the numerous analyses collected by Dr. M. E. 

 Wadsworth ' demonstrate, contain chromium and nickel. Most 

 stony meteorites contain these same elements, and even the iron 

 meteorites, in which the presence of nickel is so characteristic, 

 frequently contain chromium. The late Dr. Lawrence Smith has 

 described 2 nodules of chromite in meteoric iron, and has described 

 a new sulphide of chromium and iron, under the name of Dau- 

 breelite, 3 peculiar to meteorites, and, as he believes, almost con- 

 stantly present. 4 Chromite is well known to occur in terrestrial 

 eruptive rocks. The association of nickel and chrome has pre- 

 viously been noticed in Pennsylvania at Wood's Chrome Mine, 

 Lancaster County, where genthite 5 (described as nickelgymnite) 

 was originally found. Genthite is associated with chromite also 

 at Webster, Jackson County, North Carolina, where it forms 

 handsome apple-green specimens incrusting chromite, and it is 

 said to have a similar association at Malaga, Spain. Zaratite, a 

 carbonate of nickel, occurs with chromite in West Nottingham, 

 Chester County. Genthite has also been found at two other 

 chrome-ore mines in Lancaster County, but until now not else- 

 where in this State. 



Cuprite. — -Bright vermilion-red earthy incrustations of cuprite, 

 were noticed at Frankford, Philadelphia, in the quarries of horn- 

 blendic gneiss, so well known to mineralogists. This red oxide 

 of copper here sometimes forms a coating on bornite, which latter 

 is a beautiful, and somewhat abundant, mineral, at these quarries. 

 The cuprite has in this association a peculiarly resinous lustre, 

 and the specimens collected closely resemble red sealing-wax. 



Bothriocephalus in a Trout. — Prof. Leii>> remarked that 

 through Dr. F>. II. Warren he had recently received from the 

 Smithsonian Institution, several vials with tape-worms, obtained 



l>\ Mr. L. M. Turner, from a trout, Salvelinus ? , at Ft. Chimo, 



Ungava. One of the vials contained eighl worms ranging from 

 3 to 8 inches long, together with fragments of others; and was 

 labeled, " Passed from a 'front, caught in the river. August 14, 

 1882.'' The worms belong to a species of Bothricephalus or 

 Dibothrium, apparently different from either the D. infundibu- 

 liforme or I '. proboscidev m , round in Salmo salvelinus, S. salar, 



Mem. Mns. Comp. Zool. Oambr., \i, I, Lithological studies, tables. 

 : Amer. Jour. Science, sxi, 1881, p. 161. 

 ■ ; Amer. Jour. Science, xii, 1876, p. 107, and \\i. 1878, p. 270. 

 ' i iriginal Researches, 188 1, p. 5 13. 



Keller-Tiedemi , Nordam. Monatsbericht, iii, 488. 



■ Report B, Second Geolog. Survej ofPenna., p. lis. 



