260 



THE GUIDE TO XATlkE 



Tin-; Guide to Nature and has been 

 properly instructed by this magazine. 

 To call down some sportsman who 

 tells of the wonderful excitement of the 

 chase that took place only in his own 

 imaginative brain, bring out the illus- 

 tration of the three automobiles in pur- 

 suit of the rabbit, ami gently remark': 

 "You had an exciting time hut it was 

 not at all equal to the way in which 

 1 ran down a hunny and captured him 

 with a cowboy's lasso." 



So, for the lesion that they convey, 

 publishing these pictures is, we believe, 

 promoting the cause "of things as they 

 are." We have decided to supply these 

 postal cards. < )rder by number either 

 from this or the September issue, and 

 tiny will he sent — one postpaid, for 

 live cents, or six for twenty-five cents. 

 We can also send at the same price 

 others equally good, the selection to 

 be left to us. 



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THE MINERAL COLLECTOR 



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Address all correspondence to Arthur Chamberlain, Editor, 56 Hamilton Place, New York City 



The Pennsylvania Railroad Tunnels in 

 New York. 



BY MAURICE BLUMENTHAL, L0CKP0RT, 

 NEW YORK. 



Through the excavation and con- 

 struction of the Manhattan crosstown 

 tunnels, running parallel about 80 

 feet under Thirty-second and Thirty- 

 third streets, from the East River west 

 to Seventh avenue, New York City, by 

 the United Engineering and Contract- 

 ing Company of A"ew York, I have 

 been afforded the splendid opportunity 

 of seeing the rock structure of the great 

 metropolis and all the minerals found 

 therein. This should be of special 

 value and interest to collectors and 

 students. 



The rock through which these mon- 

 ster twin tunnels (40 feet wide and 20 

 feet high) was bored is gneiss. The 

 Island of Manhattan is composed and 

 built on this same rock, from the Bat- 

 tery to the Bronx. 



The work, drilling and blasting, was 

 carried on day and night. Whenever 

 in the tunnels, after a blast, would 

 search the "muck ' for specimen. The 

 following, although concise, form the 

 essence of my mineral finds, covering 



a period of three years, viz.: mica (in 

 large plates and crystals), orthoclase 

 (pink, red and pearly white), plagio- 

 clase, kaolin (decomposed feldspar), 

 yellow ochre, chlorite, talc, steatite. 

 tremolite, apatite (small crystals), still- 

 bite (dark yellow), heulandite (fine 

 crystals, yellow and brown), tourma- 

 line (black only, slender crystals, up to 

 several inches in length), calcite crys- 

 tals, quartz, iron pyrites, staurotide, 

 small crystals and garnets. Some of 

 the garnets were of good color and 

 size. Molybdenite was also encoun- 

 tered, but very sparingly. Geodes are 

 also rare in this rock, but several beau- 

 ties were found (in places where the 

 rock was wet and soft). A geode I 

 found in the Thirty-second street tube, 

 near Second avenue, measured almost 

 two feet in width and a foot in height, 

 lined with a layer of iron pyrites, a 

 quarter of an inch thick. On the py- 

 rites was a thin layer of calcite, and 

 from this projected an abundance of 

 beautiful dogstooth spar or calcite 

 crystals of a light yellow hue. The 

 cavity of a second geode was also lined 

 with crystals of dogtooth spar, but all 



