Abstract of History. xxiii 
MEMBERSHIP. 
Members are classified as active members, corresponding 
members, honorary members and patrons. Active member- 
ship is limited to persons interested in science, though they 
need not of necessity be engaged in scientific work, and they 
alone conduct the affairs of the Academy, under its constitu- 
tion. Persons not living in the city or county of St. Louis 
who are disposed to further the objects of the Academy, by 
original researches, contributions of specimens, or otherwise, 
are eligible as corresponding members. Persons not living 
in the city or county of St. Louis are eligible as honorary 
members by virtue of their attainments in science. Any 
person conveying to the Academy the sum of one thousand 
dollars or its equivalent becomes eligible as a patron. 
Under the by-laws, resident active members pay an initia- 
tion fee of five dollars and annual dues of six dollars. Non- 
resident active members pay the same initiation fee, but 
annual dues of three dollars only. Patrons, and honorary and 
corresponding members, are exempt from the payment of 
dues. Each patron and active member not im arrears is 
entitled to one copy of each publication of the Academy issued 
after his election. 
Since the organization of the Academy, 988 persons have 
been elected, to active membership, of whom, at the present 
time, 264 are carried on the list. Four patrons, Mr. Edwin 
Harrison, Mrs. Eliza McMillan, Mr. William Northrop 
MeMillan and Mr. Henry W. Eliot, have been elected. The 
list of corresponding members (Vol. X., p. xi) includes 205 
names, among which are the names of 103 persons known to 
_ be deceased. : 
The presence of a number of eminent scientists from all 
parts of the world at the International Congress during the 
World’s Fair of 1904, was considered a suitable occasion for 
electing the following gentlemen as honorary members of the 
Academy, in recognition of their valuable services to science: 
Prof. Svante Arrhenius (Stockholm), Prof. Dr. Leopold 
