﻿484 Scientific Intelligence. 



regards color, perfection of form, and crystallographic interest, 

 have not been surpassed at this locality. The largest emerald 

 weighed nearly nine ounces and was three inches long by one 

 and three-quarters in diameter. All the crystals possessed the 

 same relative proportion of thickness to length (2 : 3), and 

 were alike in being doubly terminated. The plane of attach- 

 ment to the walls seemed to be relatively the same on all. Hair- 

 like needles of some unidentified mineral penetrated the emerald 

 crystals more or less ; which feature pertains also to certain rare 

 crystals of green spodumene from the same locality. The occur- 

 ring planes were principally the ordinary prism I and the basal 

 pinacoid 0, though 2-2, 1 and other pyramids were noticed. 

 The usual characteristic feature of vertical striation was hardly 

 observable. The polish of the basal pinacoids was remarkably 

 perfect, as was shown by two of the crystals being placed end to 

 end supporting each other when held vertically. One of the 

 crystals was especially remarkable from having implanted upon a 

 prismatic face, a very brilliant crystal (2X10 mm.) of rutile, of 

 perfect form, which seemed to be in exact parallel position axially 

 with the emerald. A very low obtuse pyramid was finely devel- 

 oped (2X6 mm.) on two of the crystals and upon being meas- 

 ured with a reflective-goniometer by Mr. Edward S. Dana has 

 been proved to be new to the species. Its symbol is ■$-- 2 

 (1-1-2-12.) Its angle on is 4° 27' to 4° 49' measured, 4° 44^' 

 calculated, also -|— 2^-J— 2, adj. = 4° 24' measured and 4° 44' calc. 

 This new plane lies in the zone i-2 : 2-2 : 0. It was striated 

 horizontally. 



The discovery above described was followed a week later by the 

 finding of hiddenite (emerald-spodumene) crystals of fine color 

 and in one instance of unprecedented size. They were found only 

 about three rods west of the point where the emeralds were found. 

 About ten ounces of fine green crystals were found in the pocket, 

 which was but four feet in extent, and otherwise a very narrow 

 seam in the partly disintegrated gneissic rock. The accompany- 

 ing minerals were the same as in the emerald pocket already 

 described; no beryls or emeralds were found with the spodumene, 

 as is the general rule at this locality. The largest crystal 

 weighed -J an ounce and was two and three-quarter inches long 

 and three-sixteenths by nine-sixteenths of an inch through the 

 clino- and ortho-axes. It is a twin, with a projecting edge at the 

 termination. The color at the terminal end, for three-quarters of 

 an inch, was a fine emerald-green, while the balance of the crys- 

 tal was of a chrysolite green shade. 



3. Mineral Physiology and Physiography, a second series of 

 chemical and geological essays, with a general introduction, by 

 T. Stbkey Hunt. ^710 pp. 8vo. Boston, 1886 (S. E. Cassino).— 

 The essays here collected include Dr. Hunt's more recent con- 

 tributions to science, namely, "Nature in Thought and Lan- 

 guage," " The order of the Natural Sciences," papers on the 

 atmosphere, celestial chemistry, the origin of crystalline rocks. 



