174- *n e ^K at:Ura l Hiflory 



88. And thus I had finifh'd the Chapter of Flints, but that I 

 think fit to acquaint the Reader of a further defign I have concern- 

 ing them, viz. Of enquiring hereafcer into fome other aedknts 

 of Plants of an inferior quality to any before mentioned ; which 

 yet perhaps are more abftrufe in their confideration than the more 

 noted ones are. And fuch are the bkbs or hlislers we find on the 

 leaves of many Trees and. Shrubs, which fomtimes happen to them 

 after heat and droughts, and fomtimes too upon cold nipping 

 weather: but whether thus infected from the air from without, 

 or by juices within, or by both ; and when by one, or the other, 

 or both together ? is a Qvejiion requires a great deal of time, and 

 more feduiity than has yet been afforded, to be but probably fol- 

 ved. 



89. A;idthisl the rather defign, becaufeall that I find certain 

 concerning them yet, is only that the weak, and free growing 

 fappy Trees are moft fubjeft to them,and the ftout Ever-greens but 

 little, if at all: that the infection for the moft part is under, and 

 the blisler above the leaf, but fomtimes otherwife : that the bli- 

 fiers fomtimes have Infecls in them, fomtimes bear fungus's on 



their tops l , and fomtimes have neither : But what kind oflnfefls 

 or fungus's they are, that belong to each Plant that have them ? 

 or whether the fame Plants have not fomtimes different Infetts 

 and fungus's, efpecially in dry, and wet years? are alfo Quefiions 

 that require indefatigable induftry, to be in any meafure fatisfied.- 



90. And yet even in thefe, if Godgive me life, and I find en- 

 couragement to proceed in my undertaking, I intend to attempt 

 fomthing. As alfo to find out how it comes to pafs,that of the 



feeds of many Plants, fuch as Oak, Ajh, Elm, Beech-, Tew, Ju- 

 niper, Hemp, isre. there come tome Plants again that will never 

 bear feeds, if not timely prevented by our Learned Prcfefor of 

 Natural Philcfophy, the Ingenious Dr. Millington ; the Learned 

 Dr. Morifon our Botanic Profeffbr; or the Learned and accurate 

 Dr. Grew, now reading, writing, and pra&ifing the Anatomy, of 

 Vegetables. 



1 See Mr. Hooks Micrograph. Obfervat. 19. 



CHAP. 



