Letters written by Leeuwenhoek during Period 1

Alle de Brieven / Collected Letters has over 350 letters. However, only those in this chronology that Leeuwenhoek designated Letter 1, Letter 2, etc. did he consider to contain publishable microscopic observations.

Date
April 28, 1673 Wrote Letter 1 of 1673-04-28 (AB 1) to Henry Oldenburg
August 15, 1673 Wrote Letter 2 of 1673-08-15 (AB 2) to Henry Oldenburg
November 8, 1673 Wrote letter of 1673-11-08 (AB 3) to Henry Oldenburg
April 5, 1674 Wrote letter of 1674-04-05 (AB 4) to Constantijn Huygens
April 7, 1674 Wrote Letter 3 of 1674-04-07 (AB 5) to Henry Oldenburg
April 16, 1674 Wrote letter of 1674-04-16 (AB 6) to Henry Oldenburg
April 24, 1674 Wrote letter of 1674-04-24 (AB 7) to Constantijn Huygens
June 1, 1674 Wrote Letter 4 of 1674-06-01 (AB 8) to Henry Oldenburg
July 6, 1674 Wrote Letter 5 of 1674-07-06 (AB 9) to Henry Oldenburg
September 7, 1674 Wrote letter of 1674-09-07 (AB 10) to Henry Oldenburg
September 7, 1674 Wrote Letter 6 of 1674-09-07 (AB 11) to Henry Oldenburg
October 19, 1674 Wrote Letter 7 of 1674-10-19 (AB 12) to Henry Oldenburg
December 4, 1674 Wrote Letter 8 of 1674-12-04 (AB 13) to Henry Oldenburg
December 26, 1674 Wrote letter of 1674-12-26 (AB 14) to Constantijn Huygens
January 22, 1675 Wrote Letter 9 of 1675-01-22 (AB 15) to Henry Oldenburg
February 11, 1675 Wrote Letter 10 of 1675-02-11 (AB 16) to Henry Oldenburg
March 26, 1675 Wrote Letter 11 of 1675-03-26 (AB 17) to Henry Oldenburg
August 14, 1675 Wrote Letter 12 of 1675-08-14 (AB 18) to Henry Oldenburg
December 20, 1675 Wrote Letter 13 of 1675-12-20 (AB 19) to Henry Oldenburg
January 22, 1676 Wrote letter of 1676-01-22 (AB 20) to Henry Oldenburg
February 22, 1676 Wrote Letter 14 of 1676-02-22 (AB 21) to Henry Oldenburg
April 21, 1676 Wrote Letter 15 of 1676-04-21 (AB 22) to Henry Oldenburg
May 29, 1676 Wrote Letter 16 of 1676-05-29 (AB 23) to Henry Oldenburg
July 28, 1676 Wrote letter of 1676-07-28 (AB 24) to Henry Oldenburg
July 28, 1676 Wrote Letter 17 of 1676-07-28 (AB 25) to Robert Boyle
October 9, 1676 Wrote Letter 18 of 1676-10-09 (AB 26) to Henry Oldenburg
October 30, 1676 Wrote letter of 1676-10-30 (AB 27) to Henry Oldenburg
November 7, 1676 Wrote letter of 1676-11-07 (AB 28) to Constantijn Huygens
November 27, 1676 Wrote letter of 1676-11-27 (AB 29) to Henry Oldenburg
February 15, 1677 Wrote letter of 1677-02-15 (AB 30) to Christiaan Huygens
March 23, 1677 Wrote Letter 19 of 1677-03-23 (AB 31) to Henry Oldenburg
May 14, 1677 Wrote Letter 20 of 1677-05-14 (AB 32) to Henry Oldenburg
October 5, 1677 Wrote Letter 21 of 1677-10-05 (AB 33) to Henry Oldenburg
October 16, 1677 Wrote letter of 1677-10-16 (AB 34) to William Brouncker
November 1, 1677 Wrote Letter 22 of 1677-11-01 (AB 35) to William Brouncker
December 2, 1677 Wrote letter of 1677-12-02 (AB 36) to William Brouncker
January 14, 1678 Wrote Letter 23 of 1678-01-14 (AB 37) to Robert Hooke
March 18, 1678 Wrote Letter 24 of 1678-03-18 (AB 38) to Nehemiah Grew
May 31, 1678 Wrote Letter 25 of 1678-05-31 (AB 39) to Nehemiah Grew
September 27, 1678 Wrote Letter 26 of 1678-09-27 (AB 40) to Nehemiah Grew
December 26, 1678 Wrote letter of 1678-12-26 (AB 41) to Constantijn Huygens
February 21, 1679 Wrote Letter 27 of 1679-02-21 (AB 42) to Nehemiah Grew