Letter, from Antoni van Leeuwenhoek to the Royal Society Sent a printed copy instead of a signed autograph Observations of the structure and origin of ear wax and the small hairs from the external ear passage; observations of particles secreted from human bodies in general; observations of the growth and structure of body hairs; draughtsman instructed to draw magnifyed sheep's wool; determining the amount of secreted sweat; observations of the composition of sweat; on the possibility that sperm might penetrate the ovum No figures attached Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by a Committee of Dutch Scientists, vol 10, p 5 2 March 1694