_B._ No: one part riseth and another falleth at the same time; because the motion of the earth rising and falling, is that which makes the tide. _A._ Have you any experiment that shows it? _B._ Yes. You know that in the Thames, it is high water at Greenwich before it is high water at London-bridge. The water therefore falls at Greenwich whilst it riseth all the way to London. But except the top of the water went up, and the lower part downward, it were impossible. _A._ It is certain. It is strange that this one motion should salve so many appearances, and so easily. But I will produce one experiment of water, not in the sea, but in a glass. If you can show me that the cause of it is this compounded motion, I shall go near to think it the cause of all other effects of nature hitherto disputed of. The experiment is common, and described by the Lord Chancellor Bacon, in the third page of his natural history. Take, saith he, a glass of water, and draw your finger round about the lip of the glass, pressing it somewhat hard; after you have done so a few times, it will make the water frisk up into a fine dew. After I had read this, I tried the same with all diligence myself, and found true not only the frisking of the water to above an inch high, but also the whole superficies to circulate, and withal to make a pleasant sound. The cause of the frisking he attributes to a tumult of the inward parts of the substance of the glass striving to free itself from the pressure. _B._ I have tried and found both the sound and motion; and do not doubt but the pressure of the parts of the glass was part of the cause. But the motion of my finger about the glass was always parallel; and when it chanced to be otherwise, both sound and motion ceased. _A._ I found the same. And being satisfied, I proceed to other questions. How is the water, being a heavy body, made to ascend in small particles into the air, and be there for a time sustained in form of a cloud, and then fall down again in rain?