INDEX. 
653 
Water-lime group, 2. 
— limestone, 325, 333, 349 - 350. 
— mine in, 484. 
Water (potable), how obtained on salt 
marshes (note), 18. 
— how obtained on sea beaches, 146. 
— borings for, 18, 19, 136 - 143, 146. 
— impure beneath great cities, 147. 
— Croton, 147. 
— on the earth constant in quantity, 
154, 219. 
W’ells, Artesian, 146, 
— principles involved, 146, 
— why not successful in the city of 
New-York, 146- 147. 
Westchester county, primaiy of, 3. 
Whetstones, 316. 
White creek alluvions, 6. 
Whitehall, 6. 
— limestone (raetamorphic), 320. 
Williarastown marshes, 18. 
Wind, effect of in raising the level of 
water on the lakes, 6. 
Wood creek alluvia, 6. 
— quaternary, 2. 
Wood (fossil) of Troy, 140. 
— Long island, converted to limonite, 
172. 
— lignite, 252. 
Wrinkled and folded strata, 249, 250, 
335, 356, 367, 381. 
Wyckoff, John, 17, 20, 29. 
Xanthidium, 51, 55, 56. 
Xanthite, 467. 
Y. 
Yellow garnet, 514. 
Youngite, 513. 
Z. 
Zigzag contortion, 389, 459. 
Zinc, sulphuret of, 307, 314, 358, 359, 
360, 361. 
— oxide of, 497. 
— red oxide of, 471. 
Zircon, 465, 467, 469, 477, 484, 579. 
Geol. 1st Dist. 
87 
