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A SHORT LIST OF LEEUWENHOEK’S WRITINGS 
HERE is still no complete edition of all Leeuwenhoek’s 
letters: and of those already published there are so 
many versions that specific reference to any particular 
passage is often a matter of grievous difficulty. The biblio- 
graphies already printed by Gronovius (1760), Pritzel (1872), 
and many others, are so incomplete and otherwise imperfect 
as to be almost worthless. But a committee of experts has 
lately been formed in Holland with the object of printing or 
reprinting all Leeuwenhoek’s extant writings; and we may 
therefore hope that the material for a full and accurate biblio- 
graphy will shortly be collected and collated, and placed at the 
disposal of the public. 
In the meantime, since I have not the leisure or learning 
—still less the funds—of the Dutch committee, but owe it to 
my readers to give the sources of my own information, I can 
only offer the following record of those writings which I have 
myself consulted. For the present work I have had to study 
every available manuscript and publication in order to collect 
the passages relating to protozoa and bacteria, and I have 
therefore had to catalogue every discoverable letter and collate 
all its versions. But my own private list of Leeuwenhoek’s 
writings, so compiled, is still far too faulty to print here—and 
also far too long: and moreover this is obviously not the place 
to publish such a compilation. I therefore give now only the 
briefest indication of my sources for the assistance of fellow- 
students. 
MANUSCRIPTS 
The Leeuwenhoek Manuscripts in the possession of the Royal 
Society: 4 volumes, containing also numerous translations, 
drawings, and other relevant material. Lmperfectly catalogued 
by Halliwell-Phillipps (1840). Referred to, here throughout, 
as ‘ Roy. Soc. MSS.” Together with a few letters among the 
Boyle MSS. and elsewhere in the Society’s archives, and 
