On a Battery and Electric Clock. By J. E. W.

On Anti-Water Drinking. By C. P. W.

On Snakes Catching Fish. By C. R. G.

On Utilization of Sewage. By Dr. H. D. T.

On Aerial Navigation. By C. W.

On the Ash-Colored Salamander. By C. F. S.

HINTS TO CORRESPONDENTS.

Correspondents whose inquiries fail to appear should repeat them. If not then published, they may conclude that, for good reasons, the Editor declines them. The address of the writer should always be given.