140 



1760 



1765 



1 707 



1780 



1784 



1785 



183c. 



1793 



1798 



1800 



1840 



1850 



1850 



i860. 



i860 



1870. 



1870 



t88o. 



1890 . 



(In the above tabic the entire line sliows the hfe period, tlie 

 sohd hue tlie period of jnibhcation on ferns.) 



