vlqfiio:), iio ob 'Jiadj id \ 
HI. Part of a Ie//er 0/ Mr Anthohy Van Lcu- 
wenhdeck, F/i?. S. concerning Excrefcena'es 
growing on Willow Leaves^ &x. 
Deli in HoUandv jBfl.j28. N. St. 1701. 
' to,. - • 4 
I. Took the Lqave^ jof \yiUo\v Trees, - fuch r -were 
much larger and greener than the rell:, andopen'd 
the Knotty part which are found in fom^ of them, 
wherein I frequently difcoy^r'd more than one fort of 
Worms 5 but none of rhem being full grown, I cut 
fome of thofe Knots off Iv5av.es, and opening one a 
little, I faw there vras ^. \Vorm in it^ and (hyt it toger 
ther again 5 I put ieveraloi thefe Knots ; inter, a gteait» 
gUCs Tube, to the end that the. \yorii>a- might- attain, 
their fuil growth, but I could not find that any of them, 
did fo. I obferved atrthe fame time, that feveral of 
thofe Knots had no Worms in them, but, were almoft. 
full of th^ Excrements- of .'the Worms that had been in 
them, and.;W:ere diflbdged thro a fmall hole, which I 
could perceive in the Knots. 
Fig. I. ABCDE reprefents the Leaf of a Willow 
Tree, in which are feven Knobs or Tumors, fome of 
them with holes in them, asFGH, another, as K, 
fho^s the Pofture of the rWbrtn, as it lay in that Knob 
which I diffeded. 
I obferved farther, that feveral of the Worms lay 
dead in the Knobs, and mufing with my felf what fhould 
be the reafon of it, I was at laft aware that there was a 
fmall Worm laft linkt to the great one, which fmall 
Worm had no conveniency of getting out, being at 
