nd regular periment with this interesting representative of the effect of pouring oil on water was well known to the Coleoptera. It resembles closely the^. oeulatus, which flow, owing to which the sheet of oil extends to a dis- ancients, but has been neglected in modern times tance better than by… … communication on this sub- tell the time of night. It is Pig. 2.-LIFE-B0AT WITH OIL BAG. Fig. 3.-0IL BAG AT THE ENTEANCE OF A PORT 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…
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