GREAT MEN OF ANCIENT TIMES. 1 17 



de Jussieu, 

 born between 1639 and 1666 say 1663. 



Antoine, b. 1686. X-(i7o6?) Bernard, b. 1699. 



Antoine Laurent, X-(i749?) 



b. 1748. 



.1 



Adrian, b. 1797. [49] Laurent Pierre, 



b. 1792. 



As the original de Jussieu was probably not less than 20 when 

 his son Antoine was born, and probably not more than 60 when 

 Bernard was born, we have his birth located somewhere in the 

 27 years between 1639 and 1666. If the unrecorded son were born 

 before 1686 or after 1699, then the birth of the original de Jussieu 

 would be restricted within narrower limits. But as this would 

 require an unnecessary assumption we can, for the present, pre- 

 sume that he was an intermediate son. Having determined that 

 the original de Jussieu was born between 1639 and 1666, he can, 

 with perfect fairness, be assumed to have been born midway be- 

 tween these extremes, or. in 1652-3, and we may figure from this 

 date to the birth of Laurent Pierre in 1792. To avoid an error, 

 however, that might lead to exaggeration, I assume that he was 

 as young as reasonable, say between 22 and 25, when Antoine was 

 born. If we assume that he was not older than 23 when his son 

 Antoine was born, then we have his birth located in 1663, a date 

 as unfavorable to the theory of great age as is reasonable for us 

 to assume. Then taking the difference between 1792 and 1663 



