Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed letter Concerning the reproduction of trees; the transfer of nutrients from cell to cell; observations of fruits and seeds; denies that there are male and female trees; concerning the structure of the hazelnut; comparing reproduction of mammals with the reproduction of plants; consideration of cross-breeding; experiments on the germination of willow seeds Text refers to 19 figures - six figures are attached Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 5, p 215 English extract printed in 'Philosophical Transactions', vol 17, no 199, p 700 13 July 1685