276  Field  Columbian  Museum — Reports,  Vol.  i. 
relations  sustained  with  contemporaneous  agencies  for  an  exchange 
of  material  are  very  satisfactory  and  have  been  productive  of  much 
benefit.  The  preliminary  negotiations  in  the  matter  of  these  ex- 
changes are  conducted  by  the  curators  of  departments,  and  when 
ready  for  conclusion  are  submitted  to  the  Director  for  his  approval. 
The  cost  of  carriage  is  paid  in  each  case  by  the  party  receiving  the 
material  and,  as  stated,  regular  accounts  are  kept  by  the  Recorder 
with  the  persons  or  institutions  with  whom  exchange  relations  are 
established.  The  catalogues  of  material  available  for  exchange, 
heretofore  issued,  have  assisted  materially  in  opening  correspond- 
ence, and  several  other  institutions  have  adopted  this  method  of 
acquainting  museums  and  collectors  of  their  possessions.  The  num- 
ber of  specimens  sent  in  exchange  during  the  year  was  3,548,  repre- 
senting thirty-nine  different  transactions.  The  number  of  specimens 
received  in  exchange  was  4,226,  representing  twenty-five  transactions. 
Expedition  and  Field  Work. — The  expeditions  and  field  work  of 
the  Museum  have  been  confined  this  year  to  North  America,  and 
have  all  been  authorized  with  special  regard  to  the  direct  needs  of 
the  department  in  each  particular  instance,  thus  carrying  out  the 
instructions  of  the  Executive  Committee,  that  staff  collections  and 
original  research  must  be  upon  an  outlined  system,  and  confined,  as 
far  as  possible,  to  the  domestic  field.  Following  is  a  list  of  the 
expeditions  of  the  Museum  since  the  date  of  the  last  report  : 
Date.                 Locality.                     Collectors.  Material. 
Nov.  9,  1897,  .  Northeast  Arkansas,   .  S.  E.  Meek,    .    .  .  Fishes,  etc. 
Jan.  15,  1898,  .  Missouri,  O.  C.  Farrington,  .  Fossils,  etc. 
Jan.  31,  1898,  .  Tampa,  Florida,     .    .  S.  E.  Meek,    .    .  .  Fishes. 
Jan.  28,  1898,  .  Oraibi,  Arizona,  .    .    .  George  A.  Dorsey  (  Plaster  Casts 
and  F.  B.  Melville,  .   (  Moki  Indians. 
Mar.  15,  1898,  .  Southwest  Missouri,  .  H.  W.  Nichols,  .  .  Lead  and  Zinc  Ores. 
May  31,  1898,  .  Missi'pi  and  Arkansas, 
(North  American  Forestry),  .    .  C  F.  Millspaugh,  .  Plants  and  Woods. 
Mar.  22,  1898,  .  Bad  Lands,  S.  Dakota,   O.  C.  Farrington 
and  E.  S.  Riggs,  
July  12,  1898,  .  Olympian  Mountains,  D.  G.  Elliot  and 
C.  E.  Akeley,  .    .  .  Mammals. 
July  15,  1898,  .  Northern  Michigan, 
(North  American  Forestry),  .    .  C.  F.  Millspaugh,  .  Plants  and  Woods. 
June  30,  1898,  .  LaCrosse&  Elroy,Wis.,  E.  B.  Chope,  .    .  .  Insects. 
July  25,  1898,  .  Havana,  Illinois,     .    .  S.  E.  Meek,    .    .  .  Fishes,  etc. 
Sept.  9,  1898,  .  Mitchell,  Indiana,  .    .  S.  E.  Meek,    .    .  .  Fishes,  etc. 
Mr.  Dorsey,  Curator  of  the  Department  of  Anthropology,  accom- 
panied by  Mr.  F.  B.   Melville,  visited  the  province  of  Tusayan, 
