Figure 6. 



Point of a needle, magnified. 

 Reproduced from a Dra^Ying• made by Hooke in the year 1665. 



Figure 7. 



Edge of a razor, magnified. 

 Reproduced from a Drawing made by Hooke in the year 1665. 



These Figures are about three-fifths size of Hooke's enlargement. 



