Article 1, Section 3, Clauses 1 and 2
Document 16
Charles Pinckney to James Madison
28 Mar. 1789Documentary History 5:168--69Are you not, to use a full expression, abundantly convinced that the theoretical nonsense of an election of the members of Congress by the people in the first instance, is clearly and practically wrong.--that it will in the end be the means of bringing our councils into contempt & that the legislature are the only proper judges of who ought to be elected?----
Are you not fully convinced that the Senate ought at least to be double their number to make them of consequence & to prevent their falling into the same comparative state of insignificance that the state Senates have, merely from their smallness?--
The Founders' Constitution
Volume 2, Article 1, Section 3, Clauses 1 and 2, Document 16
http://press-pubs.uchicago.edu/founders/documents/a1_3_1-2s16.html
The University of Chicago Press
Documentary History of the Constitution of the United States of America, 1786--1870. 5 vols. Washington, D.C.: Department of State, 1901--5.