Morifon. 303 
as they did not profefs to write a fyflem, 
are here too rigidly tried by rules, not in- 
vented when they wrote, and of confe- 
quence the validity of which they could not 
have acknowledged. 
In a dialogue at the end of the " Hoi'tiis 
Blefenjisy' Mori son teaches, that the ge- 
nera of plants fliould be eftablifhed on cha- 
racters drawn from the fruit, and not on 
any fenfible qualities, or fuppofed medicinal 
virtue. He alfo learnedly defends the doc- 
trine, that all vegetables arife from feed; 
a propolition not univerfally allowed ; the 
dodlrine of equivocal, or fpontaneous gene- 
ration, having, at that time, many advo- 
cates among the learned. 
Dr. Mori SON, during his refidence ia 
France^ in his occafional journies to Parisy 
about the year 1658, became familiar in the 
family of Lord Hat ton, then refident at 
St. GermamSy and whofe fecond fon Charles 
was much attached to natural hiftory, and 
became a voluntary and zealous difciple of 
our author. Sixteen years afterwards, Mr. 
Charles Hat ton fent over, at the author's 
requeft, a treatife, with the plates already en- 
graved. 
