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The numerous inhabitants of the airj earth> and 

 waters, arc ftrongly influenced by the feafons, and 

 by the ftare of the atmofphere ; and the fame 

 caufes, perhaps, that rapidly call myriads of one 

 fpecies into being, may frequently prove the de« 

 ftruftion of another. Is it then improbable, that 

 fome infed finds its food, and lays its eggs, on the 

 tender fucculent grafs found on particular foils, 

 (efpecially wet ones) which it .mod delights in? 

 Or that this infed fhould, after a redundancy of 

 moifture, by an inftindive impulfe, quit its dank 

 and dreary habitation, and its fecundity be greatly 

 increafed by fuch feafons, in conjundion with the 

 prolific warmth of the fun ? 



The flefh-fiy lays her eggs upon her food, which 

 alfo ferves to fupport her future offspring; and 

 the common earth-worm propagates its fpecies 

 above ground, when the weather is mild and moid, 

 or the earth dewy. 



The eggs depoficed on the tender germ are con- 

 veyed with the food into the ftomach and inteftines 

 of the animals, whence they are received into the 

 ladeal vefTels, carried off in the chyle, and pafs into 

 the blood j nor do they meet with any obflru6lion 

 until they arrive at the capillary veflTels of the liver. 

 Here, as the blood filtrates through the extreme 



branches. 



