That when all the Cheese was turned into Maggots, it might be said to have local, progressive motion. They answered, That when the Cheese by its own figurative motions was changed into Maggots, it was no more Cheese. The Empress confessed that she observed Nature was infinitely various in her works, and that though the species of Creatures did continue, yet their particulars were subject to infinite changes. But since you have informed me, said she, of the various sorts and productions of Animal Creatures, I desire you to tell me what you have observed of their sensitive perceptions? Truly, answered they, Your Majesty puts a very hard question to us, and we shall hardly be able to give a satisfactory answer to it; for there are many different sorts of Creatures, which as they have all different perceptions, so they have also different organs, which our senses are not able to discover, onely in an Oystershell we have with admiration observed, that the common sensorium of the Oyster lies just as the closing of the shells, where the pressure and re-action may be perceived by the opening and shutting of the shells every tide. After all this, the Empress desired the Worm men to give her a true Relation how frost was made upon the Earth? To which they answered, That it was made much after the manner and description of the Fish- and Bird-men, concerning the Congelation of Water into Ice and Snow, by a commixture of saline and acid particles; which relation added a great light to the Ape-men, who were the Chymists, concerning their Chymical principles, Salt, Sulphur, and Mercury. But, said the Empress, if it be so, it will require an infinite multitude of saline particles to produce such a great quantity of Ice, Frost and Snow: besides, said she, when Snow, Ice and Frost, turn again into their former principle, I would fain know what becomes of those saline particles? But neither the Worm-men, nor the Fish- and Bird-men, could give her an answer to it.