Figures in Period 3

January 1, 1687 - April 30, 1694

The 42 letters from Letter 53 of April 4, 1687 (AB 98) through Letter 83 of April 4, 1694 (AB 137).

Of the 33 letters with scientific observations, 28 of them had a total of 315 figures.

Leeuwenhoek published 31 of these letters in Works II.

Only one of these, Letter 71 of March 7, 1692, was published in Philosophical Transactions even though Leeuwenhoek sent all of the 31 letters to the Royal Society and even dedicated Derde Vervolg der Brieven (Third Continuation of the Letters) to Queen Mary.

During his lifetime, all of the letters in Vervolg der Brieven (Continuation of the Letters) were published in translation. The two journals below published in the year or two after these letters were written. They were not published Philosophical Transactions at all and not published in Latin translation by Leeuwenhoek until 1695.

In 1688, Jean Le Clerc published excerpts from nine of Leeuwenhoek's letters in the ninth volume of Bibliothèque universelle. He included the eight letters in Vervolg der Brieven as well as Letter 65 of September 7, 1688, separately titled Den Waaragtigen Omloop des Bloeds (On the True Circulation of the Blood). These were translations from Leeuwenhoek's Dutch. Of the 76 figures in Vervolg der Brieven, Le Clerc published only two of the ten in Letter 57 of August 6, 1687, and four of the eight in Letter 58 of September 9, 1687. He also published four of the 15 figures in Omloop des Bloeds.

In 1689, Otto Mencke published the eight letters in Vervolg der Brieven in volume 8 of Acta Eruditorum. He published eight of the 10 figures in Letter 57 of August 6, 1687, and two of the 11 in Letter 59 of October 17, 1687.

Works II

Vervolg der Brieven

Summary: 76 figures in 8 of the 8 letters

date written AB/CL # AvL/Cole # # of figures
1687-04-04 98 53 5
1687-05-09 99 54 7
1687-06-13 100 55 28
1687-07-11 101 56 2
1687-08-06 102 57 10
1687-09-09 103 58 8
1687-10-17 104 59 11
1687-11-28 105 60 5
76

Tweede Vervolg der Brieven

Summary: 99 figures in 7 of the 7 letters

date written AB/CL # AvL/Cole # # of figures
1688-05-25 106 61 21
1688-07-06 107 62 5
1688-08-03 108 63 14
1688-08-24 109 64 21
1688-09-07 110 65 15
1689-01-12 113 66 17
1689-04-01 114 67 6
99

Derde Vervolg der Brieven

Summary: 83 figures in 7 of the 8 letters

date written AB/CL # AvL/Cole # # of figures
1692-01-04 117 69 4
1692-02-01 118 70 22
1692-03-07 119 71 15
1692-04-22 120 72 4
1692-06-24 121 73 4
1692-08-12 122 74 20
1692-09-16 123 75 14
83

Vierde Vervolg der Brieven

Summary: 57 figures in 6 of the 8 letters

date written AB/CL # AvL/Cole # # of figures
1693-10-15 126 76 20
1693-12-20 129 77 10
1694-02-24 133 79 5
1694-03-02 134 80 6
1694-04-02 136 82 5
1694-04-30 137 83 11
57

Letters without figures:

1691-11-27    116    68    Members of the Royal Society
1694-01-24    131    78    Members of the Royal Society
1694-03-19    135    81    Members of the Royal Society

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