(1687) van Leeuwenhoek .’ Between IKP the said pointed particles , cut crosswise , are shown ; they here appear untidy and not round , which it seems to me is brought about only by the cutting of the knife ; For I could ( not properly ) cut the bark with a sharp knife unless I had first put the same in water for some time .The tiny vessels that run among the parts mentioned , became as it were filled , by the cutting of the knife , so that I was unable to show them here to the draughtsman .