These Propositions are shut up by two important _Appendixes_, whereof the _one_ contains an Answer to seven Objections by a late learned Writer, to evince, that the upper parts of water press not upon the lower; the _other_, solves that difficult _problem_, why _Urinators_ or _Divers_, and others, who descend to the bottom of the Sea, are not oppressed with the weight of the incumbent water? where, among other solutions, _that_ is examined, which occurs in a printed Letter of Monsieur _des Cartes_, but is found unsatisfactory. II. _Nicolai Stenonis de Musculis & Glandulis Observationum Specimen; cum duabus Epistolis Anatomicis_. In the _Specimen_ it self, the Author, having described in _general_, both the _Structure_ and the _Function_ of the _Muscles_, applies that description to the _Heart_, to demonstrate that _that_ is also a _true Muscle_: Observing _first_, that in the substance of the _Heart_ there appears nothing but _Arteries, Veins, Nerves, Fibres, Membrans_; and that that, & nothing else is found in a _Muscle_; affirming withall, that which is commonly taught of the _Muscles_, and particularly of the _Heart's Parenchyma_, as distinct from _Fibres_, is due, not to the _Senses_, but the _Wit_ of _Anatomists_: so that he will not have the _Heart_ made up of a substance peculiar to it self, nor considered as the principle of _Innate heat_, or of _Sanguification_, or of _vital spirits_. He observes _next_, that the _Heart_ performs the like _operation_ with the _Muscles_, to wit, to contract the Flesh; which action how it can have a different cause from that of the Contraction made in the _Muscles_, where there is so great a parity and agreement in the _Vessels_, he sees not. And as for the _Phaenomena_, that occur, of the _Motion_ of the Heart, he undertakes to explicate them all, from the _Ductus_ or _Position_ of the _Fibres_; but refers for the performance of this undertaking to another _Treatise_, he intends to publish. [Sidenote: __Conglobate_ Glanduls are called those, that do consist, as it were, of one continued substance, having an _even_ superficies; whereof there are many in the _Mesentery_, and in other places: contra distinguisht to those, that bear the name of _Conglomerate_ Glanduls, which are made up of several small Kernels, such as the _Pancreas_, the _Salivating Glanduls_, &c._]