^•.2 



♦^ 





evo. 



:i 





ev 



odto 



euie, 



their 

 n vi- 



1 



v.a 



Pe 



coa. 

 lalfo 



eeras 



ly at- 



well 



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 rfea 



e 



thou- 

 [ream 



In up 

 cd,as 



witJi 



Marine 



ees 



of 





Sect. XIV. 3. 2. 



OF PLANTS. 





^ 



Richardfon, and of other philofophers, this extraordinary Infe£l rifes 

 in the fpring from eggs, which are faid to be attached by the parent 

 aphis to the twigs of trees in the autumn, and are beheved to produce 

 not a larva or caterpillar, but a progeny fimilar to the parent ; every 

 one of which produces in about ten days not an egg, but another liv- 

 ing progeny to the ninth generation, without being connected amato* 

 rially with each other. The ninth generation produces males and fe- 



rn al 



fome of both kinds with wings, and oth 



with 



them 



» 



and this tenth generation from thofe, which were hatched from 



rt£> 



hich are laid 



become amatorially conneded, and produce eggs;- vi 



the new twigs of various trees for the next year's progeny to be 



hatched by the vernaLfun. Philof.-Tranfact. Vol. LXI. p. 182. 



In this uncommon circumftance the eggs of the aphis refemble the 

 feeds of plants ; which firft produce fome fucceffive generations of 



leaf-buds, which 



parous progeny, before they 



pro 



■ 



duce feedsjvvhich are their oviparous progeny, as mentioned in Sedt, 



IX. 3. I. of this work 

 termed equivocal gen^ 



Nor is this to be aferibed to what has been. 



impregnation of 



fetufes 



enclofed within each other, as fome have fuppofed. But this central 

 produdtion of the viviparous progeny of the aphis feems 



femble 



th 



lateral product 



f 



iviparous progeny from the polyp 



which in time detach themfelves from their parents; like the buds 

 of the polygonum vivlparum^ or the bulbs of the magical onion, al- 

 lium madcum ; which are produced from the flower-cup inftead of 



feeds, and in time detach themfelves, and fall on the ground 



S& 



that thefe aphifes are not, I fuppofe 

 males, but proliferous males, as e? 

 Sedt. 39. on generation*. 



, to be efleemed fecundated fe 

 plained in Zoonomia, Vol. I 



i . 



This double mode of reprodudion, {o exactly refembling the buds 

 and feeds of trees, accounts for the wonderful increafe of this infedl-; 



which according to Dr 



Richardfon confifts of ten p-enerations. and 



a 



©f fifty 



;<ih generation ;• fo that the fum of fifty 



multiplied 



