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Microscopical Essays. 



are ufually feen placed near one another, and a vaft number of 

 thefe clutters are found on the fame tree ; the end of each of thefe 

 filaments is terminated by a fort of fwelling, or tubercle, of the 

 fhape of an egg. They have generally been fuppofed to be of 

 vegetable origin, and that they were a fort of parafitical plant, 

 growing out of others. There is a time when thefe egg-like balls, 

 which terminate every one of thefe filaments, are found open at 

 the ends; in this flate they very much referable flowers, and 

 have been figured as fuch by fome authors, though they are only 

 the eggs out of which the young animals had been hatched and 

 made their efcape. If thefe eggs are examined by a microfcope, 

 a worm may be difcovered in them ; or they may be put in a box, 

 in which, in a proper time, they will produce an infect, which, 

 when viewed with a microfcope, will be found to be the true lion 

 puceron,. 



Divine Providence inftrucls. the infecls, by a lower fpecies of 

 perception, to depofit their eggs in fituations where their young 

 ones will find the nourifhment that is mod convenient for them. 

 Some depofit their eggs in the oak leaf, producing there the red 

 gall ; others chufe the leaf of the poplar, which fwells into a red 

 node or bladder; to a fimilar caufe we are indebted for the red 

 knob which is often feen on the willow-leaf, and the three point- 

 ed protuberances upon the termination of the juniper branches. 

 The leaves of the veronica and ceraftium are drawn into a globu- 

 lar head by the eggs of an infed: lodged therein, The phalaena 

 neuftria glues it's eggs with great fymmetry and propriety round; 

 the final ler branches of trees. Fig. i, Plate X. reprefents a 

 magnified view of the neft of the eggs taken off the tree after the 

 caterpillar had eat it's way through them ; the ftrong ground-work; 



