Alle de Brieven. The Collected Letters. Volume 2
Letters 22 [15] – 42 [27] written between 1676 and 1678. Editor, C.G. Heringa
The links below take you to the text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren (Digital Library for Dutch Letters).
Cole's number, usually the same as Leeuwenhoek's, is in brackets. These are the numbers used by Dobell, who wrote before the Committee of Dutch Scientists began collecting and numbering all of the letters.
Letter 22 [15] of 21 April 1676
Letter 23 [16] of 29 May 1676
Letter 24 of 28 July 1676
Letter 25 [17] of 28 July 1676
Letter 26 [18] of 9 October 1676
Letter 27 of 30 October 1676
Letter 28 of 7 November 1676
Letter 29 of 27 November 1676
Letter 30 of 15 February 1677
Letter 31 [19] of 23 Marach 1677
Letter 32 [20] of 14 May 1677
Letter 33 [21] of 5 October 1677
Letter 34 of 16 October 1677
Letter 35 [22] of ... November 1677
Letter 36 of 2 or 3 December 1677
Letter 37 [23] of 14 January 1678
Letter 38 [24] of 18 March 1678
Letter 39 [25] of 31 May 1678
Letter 40 [26] of 27 September 1678
Letter 41 of 26 December 1678
Letter 42 [27] of 21 February 1679