Essays in natural history and philosophy. Containing a series of discoveries, by the assistance of microscopes / By John Hill.

  • Hill, John, 1714?-1775.
Date:
1752
Catalogue details

Licence: Public Domain Mark

Credit: Essays in natural history and philosophy. Containing a series of discoveries, by the assistance of microscopes / By John Hill. Source: Wellcome Collection.

    328/434 (page 316)
    to any great Width, yet of a Length that very well anfwered to the Deficiency. It was no Wonder that we had not difco- vered this Mouth before; for, in the general State of the Animal, it is flint, and, at the ut- mol, can only be diflinguiflied in Form of a longitudinal Streak or Line *, but when the Prey is in Reach, or when, as in the prefent uneafy Situation, it was gafping, and in Agonies, the Opening v/as frequent. It was not long before the Creature recovered its natural Situation, and got its Back upwards but the Time it had con¬ tinued in the other Pollute, and the Agonies it had buffered while in it, were fufficient to give us a fair Opportunity of feeing all that regard its Organs of feeding. When a larger Magnifier has once difcovered an Object, one of fmaller Power, through which It would have been difficult to have feen it origi¬ nally, will often keep it in Sight. We now adapted Glaffies of a middle Power, between thofe which had nowr difcovered to us the whole Num¬ ber of Inhabitants, and thofe which had from the firit (hewn us their Motion, in a Manner, un¬ connected with their Forms*, and thefe continued the View of them fufficiently diftindt, and gave us an Opportunity of feeing all that palled in regard both to them and the other. I have obferved that the Segment of the Plant, inhabited by thefe Myriads of moving Atoms, was tranfparent. The Body of the larger Ani¬ malcule is fo too > and through both we could with