46  PUBLICATIONS    OF    U.    S.    GEOLOGICAL    SUKVEY.         [bull.  177. 
156.  Bibliography  and  index  of  North  American  geology,  paleontology,  petrol- 
ogy, and  mineralogy  for  the  year  1897,  by  Fred  Boughton  Weeks.  1898.  130  pp. 
Price,  15  cents. 
157.  The  gneisses,  gabbro-schists,  and  associated  rocks  of  southwestern  Minne- 
sota, by  Christopher  Webber  Hall.  1899.  160  pp. ,  6  11.,  27  pis.  and  maps.  Price, 
45  cents. 
158.  The  moraines  of  southeastern  South  Dakota  and  their  attendant  deposits, 
by  James  Edward  Todd.     1899.     171  pp.,  27  pis.  and  maps.    Price,  25  cents. 
159.  The  geology  of  eastern  Berkshire  County,  Massachusetts,  by  Benjamin 
Kendall  Emerson.     1899.     139  pp.,  9  pis.  and  maps.    Price,  20  cents. 
160.  A  dictionary  of  altitudes  in  the  United  States  (third  edition),  compiled 
by  Henry  Gannett.     1899.     775  pp.     Price,  40  cents. 
161.  Earthquakes  in  California  in  1898,  by  Charles  D.  Perrine,  assistant  astron- 
omer in  charge  of  earthquake  observations  at  the  Lick  Observatory.  1899. 
31pp.,  1  pi.     Price,  5  cents. 
162.  Bibliography  and  index  of  North  American  geology,  paleontology,  petrol- 
ogy, and  mineralogy  for  the  year  1898,  by  Fred  Boughton  Weeks.  1899.  163 
pp.     Price,  15  cents. 
163.  Flora  of  the  Montana  formation,  by  Frank  Hall  Knowlton.  1900.  118 
pp.,  19  pis.     Price,  15  cents. 
164.  Keconnaissance  in  the  Rio  Grande  coal  fields  of  Texas,  by  Thomas  Way- 
land  Vaughan,  including  a  report  on  igneous  rocks  from  the  San  Carlos  coal 
field,  by  E.  C.  E.  Lord.     1900.     100  pp.,  11  pis.  and  maps.     Price,  20  cents. 
165.  Contributions  to  the  geology  of  Maine,  by  Henry  S.  Williams  and  Her- 
bert E.  Gregory.     1900.     212  pp.,  14  pis.     Price,  25  cents. 
Preface,  by  Henry  S.  Williams,  pp.  11-14. 
Pt.     I.  The  Paleozoic  faunas  of  Maine:  A  preliminary   report   upon  the  Paleozoic  faunas 
already  known  and  upon  new  faunas  recently  collected  from  Aroostook  County,  by 
Henry  S.  Williams,  pp.  15-92,  pis.  i,  ii. 
Pt.  II.  Geology  of  the  Aroostook  volcanic  area,  including  an  account  of  the  clastic  rocks  of 
Aroostook  County,  by  Herbert  E.  Gregory,  pp.  93-188,  pis.  iii-xiv. 
Pt.  III.  List  of  localities  of  Paleozoic,  igneous,  and  other  crystalline  rocks  examined  during  the 
seasons  of  1897  and  1898,  by  Henry  S.  Williams,  pp.  189-203. 
166.  A  gazetteer  of  Utah,  by  Henry  Gannett.  1900.  43  pp.,  1  pi.  (map). 
Price,  15  cents. 
167.  Contributions  to  chemistry  and  mineralogy  from  the  laboratory  of  the 
United  States  Geological  Survey;  Frank  W.  Clarke,  chief  chemist.  1900.  166 
pp.     Price,  15  cents. 
Experiments  relative  to  the  constitution  of  pectolite,  pyrophyllite,  calamine,  and  analcite, 
by  F.  W.  Clarke  and  George  Steiger,  pp.  13-25. 
The  constitution  of  tourmaline,  by  F.  W.  Clarke,  pp.  26-36. 
The  colorimetric  estimation  of  small  amounts  of  chromium,  with  special  reference  to  the 
analysis  of  rocks  and  ores,  by  W.  F.  Hillebrand,  pp.  37-43. 
Volumetric  estimation  of  vanadium  in  presence  of  small  amounts  of  chromium,  with  special 
reference  to  the  analysis  of  rocks  and  ores,  by  W.  F.  Hillebrand,  pp.  44-48. 
Distribution  and  quantitative  occurrence  of  vanadium  and  molybdenum  in  rocks  of  the 
United  States,  by  W.  F.  Hillebrand,  pp.  49-55. 
Warning  against  the  use  of  fluoriferous  hydrogen  peroxide  in  estimating  titanium,  by  W.  F. 
Hillebrand,  p.  56. 
Mineralogical  notes,  by  W.  F.  Hillebrand,  pp.  57-76. 
On  the  chloronitrides  of  phosphorus  and  the  metaphosphimic  acids,  by  H.  N.  Stokes,  pp. 
77-153. 
On  a  hydromica  from  New  Jersey,  by  F.  W.  Clarke  and  N.  H.  Darton,  pp.  154-155. 
The  alkaline  reaction  of  some  natural  silicates,  by  F.W.Clarke,  pp.  156-158. 
The  solubility  in  water  of  certain  natural  silicates,  by  George  Steiger,  pp.  159-160. 
168.  Analyses  of  rocks  from  the  laboratory  of  the  United  States  Geological 
Survey,  1880  to  1899,  tabulated  by  F.  W.  Clarke,  chief  chemist.  1900.  308  pp. 
Price,  20  cents. 
