3. It would be superfluous to show you the shape of the yet-to-be-discussed fly, of which you will surely have many, but we should not neglect her interesting details or her coming into existence, which should be observed with diligence and an attentive spirit.

4. How and what is the origin of the fly?

5. Scientists may know that the fly lays eggs which are so small that they can hardly be seen by the human eye, and are, therefore, so light that the eggs, like sun-dust, can stay in the air very easily.