The description of several kinds of Moulds.  The method of proceeding in natural Inquiries.  Several Considerations about the nature of Mould and Mushromes. 1.  That they may be produc’d without seed. 2.  That they seem to have none. 3.  That Salts, &c. are shap’d into as curious figures without a seed. 4.  Of a kind of Mushrome growing in a Candle:  A more particular explication of this last sort of Mushromes. 5.  Of the figure and manner of the production of petrified Iceicles:  several deductions from these Considerations, about the nature of the vegetation of Mould and Mushromes.

Observ. 21.  Of Moss.

The description of several sorts of Mosses; upon this occasion several Conjectures, about the manner of the production of these kinds of Bodies, are hinted, and some of them explicated by a Similitude taken from a piece of Clock-work, The vast difference of the bigness of vegetable Bodies; and the probability that the least may comprehend as curious contrivances as the greatest.  Of multitudes of other Moulds, Mosses, and Mushromes, and other vegetating Principles, in Water, Wood, &c.

Observ. 22.  Of Sponges, and other fibrous Bodies.

Several Observations and Conjectures about the making of these Bodies, and several Histories out of Authors.  Scarce any other Body hath such a texture; the fibrous texture of Leather, Spunk, &c. (which are there describ’d) come nearest to it That upon tryal with a piece of Spunge and Oyl the necessity of respiration could not be alter’d.

Observ. 23.  Of the Form of Seaweed.

From the curiously shap’d Surface of this Sea-weed, and some others, is conjectured the possibility of Multitudes of the like.

Observ. 24.  Of the Surfaces of some Leaves.

The description, 1.  Of the bald Surfaces of Leaves. 2.  Of the downy Surfaces of several others. 3.  Of the gummous exsudation, or small transparent Pearls, discovered with a Microscope_ in several others.  An Instance of all which is afforded in a Rosemary Leaf._

Observ. 25.  Of the stinging Points of a Nettle.

A description of the Needles and several other contrivances in the leaf of a Nettle:  how the stinging pain is created:  upon this several considerations about poysoning Darts are set down.  An Experiment of killing Effs, and Fishes with Salt.  Some conjectures at the efficacy of Baths; the use that may be made of injecting into the Veins.  A very remarkable History out of Bellonius_; and some Considerations about staining and dying of Bodies._

Observ. 26.  Of Cowage.

The definition of it out of Parkinson_:  an Experiment made of it:  a description, and some conjectures at the cause of the Phaenomena._

Observ. 27.  Of the Beard of a wild Oat.

The description of its shape and properties:  the manner of making a Hygroscope_ with it; and a Conjecture at the causes of these motions, and of the motions of the Muscles._