Microscopical Observations of the Structure of Hair: Made Also and Communicated by the above Said Mr. Anthony Leeuwenhoeck

Author: 
Leeuwenhoek, A. van
Journal: 
Philosophical Transactions of the Royal Society
Volume: 
12
Publisher: 
Royal Society
Year: 
1678

pages 1003-1005 letter written 1678-05-31 Maty lists these two as four; the grain of ivory on p 1003