btain a feeble but continuous and regular periment with this interesting representative of the effect of pouring oil on water was well known to the Coleoptera. It resembles closely the Z. oculatus, which flow, owing to which the sheet of oil extends to a dis- ancients, but has been neglected in… … communication on this sub- tell the time of night. It is ject to the Franklin Institute sufficiently strong to illumin- of Philadelphia, proposes the ate a small printed page so use of a hollow metallic that the words are clearly sphere, ten inches iu diame- legible. Its radiance appears ter,…
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