IV  ADVERTISEMENT. 
49.  Latitudes  and  Longitudes  of  Certain  Points  in  Missouri,  Kansas,  and  New  Mexico,  by  Robert 
Simpson  Woodward.      1889.     8°.      133  pp.      Price  15  cents. 
50.  Formulas  and  Tables  to  facilitate  the  Construction  and  Use  of  Maps,  by  Robert  Simpson  Wood- 
ward.     1889.     8°.     124  pp.     Price  15  cents. 
51.  On  Invertebrate  Fossils  from  the  Pacific  Coast,  by  Charles  Abiathar  White.  1889.  8°.  102 
pp.     14  pi.     Price  15  cents. 
52.  Subaerial  Decay  of  Rocks  and  Origin  of  the  Red  Color  of  Certain  Formations,  by  Israel  Cook 
Russell.     1889.     8°.     65  pp.     5  pi.     Price  10  cents. 
53.  The  Geology  of  Nantucket,  by  Nathaniel  Southgate  Shaler.  1889.  8°.  55  pp.  10  pi.  Price  10 
cents. 
54.  On  the  Thermo-Electric  Measurement  of  High  Temperatures,  by  Carl  Barus.  1889.  8°.  313  pp. 
inch  1  pi.     11  pi.     Price  25  cents. 
55.  Report  of  work  done  in  the  Division  of  Chemistry  and  Physics,  mainly  during  the  fiscal  year 
1886-87.     Frank  Wiggles  worth  Clarke,  chief  chemist.     1889.     8°.     96  pp.     Price  10  cents. 
56.  Fossil  Wood  and  Lignite  of  the  Potomac  Formation,  by  Frank  Hall  Knowlton.  1889.  8°.  72 
pp.     7  pi.     Price  10  cents. 
57.  A  Geological  Reconnaissance  in  Southwestern  Kansas,  by  Robert  Hay.  1890.  8°.  49  pp.  2  pi. 
Price  5  cents.  , 
58.  The  Glacial  Boundary  in  Western  Pennsylvania,  Ohio,  Kentucky,  Indiana,  and  Illinois,  by  George 
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1  pi.     8  pi.     Price  15  cents. 
59.  The  Gabbros  and  Associated  Rocks  in  Delaware,  by  Frederick  D.  Chester.  1890.  8°.  45  pp. 
1  pi.     Price  10  cents. 
60.  Report  of  work  done  in  the  Division  of  Chemistry  and  Physics,  mainly  during  th6  fiscal  year 
1887-88.     F.  W.  Clarke,  chief  chemist.     1890.     8°.     174pp.     Price  15  cents. 
61.  Contributions  to  the  Mineralogy  of  the  Pacific  Coast,  by  William  Harlowe  Melville  and  Waldemar 
Lindgren.     1890.     8°.     40  pp.     3  pi.     Price  5  cents. 
62.  The  Greenstone  Schist  Areas  of  the  Menominee  and  Marquette  Regions  of  Michigan;  a  contri- 
bution to  the  subject  of  dynamic  metamorphism  in  eruptive  rocks,  by  George  Huntington  Williams; 
with  an  introduction  by  Roland  Duer  Irving.     1890.     8°.     241  pp.     16  pi.     Price  30  cents. 
63.  A  Bibliography  of  Paleozoic  Crustacea  from  1698  to  1889,  including  a  list  of  North  American 
species  and  a  systematic  arrangement  of  genera,  by  Anthony  W.  Vogdes.  1890.  8°.  177  pp.  Price 
15  cents. 
64.  A  report  of  work  done  in  the  Division  of  Chemistry  and  Physics,  mainly  during  the  fiscal  year 
1888-89.     F.  W.  Clarke,  chief  chemist.     1890.    8°.     60  pp.     Price  10  cents. 
65.  Stratigraphy  of  the  Bituminous  Coal  Field  of  Pennsylvania,  Ohio,  and  West  Virginia,  by  Israel 
C.  White.    1891.    8°.     212  pp.     11  pi.     Price  20  cents. 
66.  On  a  Group  of  Volcanic  Rocks  from  the  Tewan  Mountains,  New  Mexico,  and  on  the  occurrence 
of  Primary  Quartz  in  certain  Basalts,  by  Joseph  Paxson  Iddings.     1890.     8°.    34  pp.    Price  5  cents. 
67.  The  Relations  of  the  Traps  of  the  Newark  System  in  the  New  Jersey  Region,  by  Nelson  Horatio 
Darton.     1890.     8°.    82  pp.     Price  10  cents. 
68.  Earthquakes  in  California  in  1889,  by  James  Edward  Keeler.     1890.     8°.    25  pp.    Price  5  cents. 
69.  A  Classed  and  Annotated  Bibliography  of  Fossil  Insects,  by  Samuel  Hubbard  Scudder.  1890. 
8°.     101  pp.     Price  15  cents. 
70.  Report  on  Astronomical  Work  of  1889  and  1890,  by  Robert  Simpson  Woodward.  1890.  8°.  79  pp. 
Price  10  cents. 
71.  Index  to  the  Known  Fossil  Insects  of  'Hie  World,  including  Myriapods  and  Arachnids,  by  Samuel 
Hubbard  Scudder.     1891.     8°.    744  pp.     Price  50  cents. 
72.  Altitudes  between  Lake  Superior  and  the  Rocky  Mountains,  by  Warren  Upham.  1891.  8°. 
229  pp.    Price  20  cents. 
73.  The  Viscosity  of  Solids,  by  Carl  Barus.     1891.     8°.    xii,  139  pp.     6  pi.    Price  15  cents. 
74.  The  Minerals  of  North  Carolina,  by  Frederick  Augustus  Genth.  1891.  8°.  119  pp.  Price  15 
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75.  Record  of  North  American  Geology  for  1887  to  1889,  inclusive,  by  Nelson  Horatio  Darton.  1891. 
8°.     173  pp.     Price  15  cents. 
76.  A  Dictionary  of  Altitudes  in  the  United  States  (second  edition),  compiled  by  Henry  Gannett, 
chief  topographer.     1891.     8°.    393  pp.     Price  25  cents. 
77.  The  Texan  Permian  and  its  Mesozoic  Types  of  Fossils,  by  Charles  A.  White.  1891.  8°.  51  pp, 
4  pi.     Price  10  cents. 
78.  A  report  of  work  done  in  the  Division  of  Chemistry  aud  Physics,  mainly  during  the  fiscal  year 
1889-90.     F.  W.  Clarke,  chief  chemist.     1891.    8°.     131pp.     Price  15  cents. 
79.  A  Late  Volcanic  Eruption  in  Northern  California  aud  its  Peculiar  Lava,  by  J.  S.  Diller.  1891.  8°. 
33  pp.     17  pi.    Price  10  cents.  « 
80.  Correlation  papers — Devonian  and  Carboniferous,  by  Henry  Shaler  Williams.  1891.  8°.  279  pp. 
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81.  Correlation  papers— Cambrian,  by  Charles  Doolittle  Walcott.  1831.  8°.  447  pp.  3  pi.  Price 
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