Page:On the various forces of nature and their relations to each other.djvu/108

104 one from the other; and I will take as illustrations these very common things—air, water, the heaviest body, platinum, and this gas: and observe how they differ in this respect; for if I take a piece of platinum of that size (fig. 29), it is equal to the weight of portions of water, air, and hydrogen of the bulks I have represented in these spheres. And this illustration gives you a very good idea of the extraordinary difference with regard to the gravity of the articles having this enormous difference in bulk. [The following tabular statement having reference to this illustration appeared on the diagram board.]

Whenever oxygen and hydrogen unite together they produce water; and you have seen the extraordinary difference between the bulk