30  PUBLICATIONS    OF    U.   8.    GEOLOGICAL    SURVEY.         [bull.  177. 
Pt.    VI.   (Continued.)     Mineral  resources  of  the  United  States,  1898 — Continued. 
Illuminating  and  fuel  gas  and  by-products;  by  William  B.Phillips,  pp. 
225-250. 
Asphaltum  and  bituminous  rock,  by  Edward  W.Parker,  pp.251-268. 
Stone,  by  William  C.  Day,  pp.  269-464. 
Clay  products,  by  Jefferson  Middleton,  pp.  465-538. 
Cement,  pp.  539-550. 
Portland  cement,  by  Spencer  B.  Newberry,  pp.  539-546. 
American  rock  cement,  by  Uriah  Cummings,  pp.  547-550. 
Soapstone,  by  Edward  W.  Parker,  pp.  551-556. 
Precious  stones,  by  George  F.  Kunz,  pp.  557-602,  pi.  i. 
Abrasive  materials,  by  Edward  W.  Parker,  pp.  603-617. 
Phosphate  rock,  pp.  619-639. 
A  brief  reconnaissance  of  the  Tennessee  phosphate  fields,  by  C.Wil- 
lard  Hayes,  pp.  633-638. 
Sulphur  and  pyrite,  by  Edward  W.  Parker,  pp.  641-655. 
Gypsum,  by  Edward  W.  Parker,  pp.  657-666. 
Salt,  by  Edward  W.  Parker,  pp.  667-688. 
Mica,  pp.  689-707. 
Mica  deposits  in  the  United  States,  by  J.  A.  Holmes,  pp.  691-707. 
Fluorspar,  by  Edward  W.  Parker,  pp.  709-710. 
Asbestos,  by  Edward  W.  Parker,  pp.  711-714. 
Graphite,  pp.  715-718. 
Mineral  paints,  by  Edward  W.  Parker,  pp.  719-737. 
Barytes,  by  Edward  W.  Parker,  pp.  738-739. 
Fuller's  earth,  pp.  741-743. 
Quartz  and  feldspar,  by  Heinrich  Ries,  p.  745. 
Mineral  waters,  by  A.  C.  Peale,  pp.  747-769. 
Mineral  resources  of  Porto  Rico,  by  Robert  T.  Hill,  pp.  771-778. 
Investigations  of  some  of  the  mineral  resources  of  Porto  Rico,  by  H.  B. 
C.  Nitze,  pp.  779-787. 
Index,  pp.  789-804. 
Pt.  VII.  Explorations  in  Alaska  in  1898.     v,  509  pp.,  25  maps  and  38  pis. 
A  reconnaissance  in  the  Sushitna  Basin  and  adjacent  territory,  Alaska, 
in  1898,  by  George  H.  Eldridge,  pp.  1-29,  maps  1-3,  pis.  i-vi. 
A  reconnaissance  in  southwestern  Alaska  in  1898,  by  Josiah  Edward 
Spurr,  pp.  31-264,  maps  4-14,  pis.  vii-xiii. 
A  reconnaissance  from  Resurrection  Bay  to  the  Tanana  River,  Alaska, 
in  1898,  by  Walter  C.  Mendenhall,  geologist  to  Military  Expedition 
No.  3,  in  charge  of  Capt.  Edwin  F.  Glenn,  Twenty-fifth  Infantry,  U.  S. 
Army,  pp.  265-340,  maps  15-17,  pis.  xiv-xxi. 
A  reconnaissance  of  a  part  of  Prince  William  Sound  and  the  Copper 
River  district,  Alaska,  in  1898,  by  F.  C.  Schrader,  pp.  341-423,  maps 
18-21,  pis.  xxii-xxxv. 
A  reconnaissance  in  the  Tanana  and  White  river  basins,  Alaska,  in  1898, 
by  Alfred  Hulse  Brooks,  pp.  425-494,  maps  22-25,  pis.  xxxvi-xxxviii. 
Index,  pp.  495-509. 
Twenty-first  Annual  Report  of  the  United  States  Geological  Survey 
to  the  Secretary  of  the  Interior  1899-1900  Charles  D.  Walcott  Direc- 
tor In  seven  parts  Part  I. — Director's  report,  including  triangula- 
tion,  primary  traverse,  and  spirit  leveling  [Part  II. — General  geology, 
economic  geology,  Alaska;  Part  III. — General  geology,  ore  and  phos- 
phate deposits,  Philippines:   Part  IV. — Hydrography  F.  H.  Newell, 
