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BULK OF EQUAL WEIGHTS OF BODIES.
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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.]
| Hydrogen | 1.4 | ||
| Air | 14.4 | 1 | |
| Water | 11943.4 | 829 | 1.5 |
| Platinum | 256774.4 | 17831 | 21.5 |
Whenever oxygen and hydrogen unite together they produce water, and you have seen the extraordinary difference between the bulk and appearance of the water so produced and
