mine, and beyond it, at a higher level, a village which was abandoned in
the early part of this century because of marsh fever. Yet there is
a colony of workmen living about the mine, and they seem to be
advantageously affected by the emanations. M. D'Abbadie further mentions
that the engineer who made a railway through this notorious plain
preserved the health of his workmen by requiring them to drink no water
but what was known to be wholesome and was brought from a distance.

* * * * *




HYDRAULIC FILTERING PRESS FOR TREATING OLEAGINOUS SEEDS.


Messrs. Laurent Bros. & Collot exhibited at the Paris Universal
Exhibition in 1878 a patented hydraulic apparatus styled a filtering
press, the principle and construction of which it will prove of interest
to describe. The apparatus is remarkable for its simplicity and ease of
manipulation, and is destined to find an application in most oil mills.

_Details of Structure_.--The filter, which is shown in detail in Figs.
5 to 7, is formed of two semicylindrical cast iron shells, F, that are
firmly united, and held by a strong iron band which is cleft at one
point in its circumference, and to which there is adapted a mechanism
permitting of loosening it slightly so as to facilitate the escape of
the oil-cake. Within these shells, F, there are grooves, a, which have
the arrangement shown by the partial section in Fig. 11, and through
which flows the oil expressed by pressure. To prevent the escape of the