hich flows away is passed through a strainer, or the water is not
changed at all, air being driven through it by means of an apparatus put
into motion by the drinking-water supply.

"The library contains about 9000 volumes, which students use with the
help of a slip catalogue, arranged according to authors. The station has
published at intervals since 1879 two periodicals treating of the
organisms of the Mediterranean. One is _Fauna und Flora des Golfes van
Neapel_, the other _Mittheilungen aus der zoologischen Station zu
Neapel_. The former consists of monographs in which special groups of
animals and plants are most exhaustively treated and the Mediterranean
species portrayed according to life in natural colours; up to the
present time twenty-one zoological and five botanical monographs have
appeared, making altogether 1200 4to sheets with about 400 plates. Of
the Mittheilungen, which contain smaller articles on organisms of the
Mediterranean, fourteen volumes in 8vo have been published. The station
also publishes a _Zoologischer Jahresbericht_, which at first treated of
the entire field of zoology, but since 1886 has been confined
principally to comparative anatomy and ontogeny; it appears eight to
nine months after the end of the year reported. The _Guide to the
Aquarium_, with its descriptions and numerous pictures, is meant to give
the lay visitor an idea of the marine animal world.

"There are about forty officials, amongst them six zoologists, one
physiologist, one secretary, two draughtsmen, one engineer. The station
is a private institution, open to biologists of all nations under the
following conditions: there are agreements with the governments of
Austria, Baden, Bavaria, Belgium, Hamburg, Holland, Hesse, Italy,
Prussia, Russia, Saxony, Switzerland, Hungary, Wurttemberg, the province
of Naples, and the universities of Cambridge, Oxford, Strassburg,
Columbia College (New York), and the British Association for the
Advancement of Science, the Smithsonian Institution, and a society of
women in the United States of North America (formerly also with
Bulgaria, Rumania, Spain, the Academy of Sciences in Berlin, Williams
College, University of Pennsylvania), by virtue of which the governments
and corporate bodies named have the right, on payment of L100 per annum,
to send a worker to the station; this places at his disposal a 'table'
or workplace, furnished with all the necessary appliances and materials
as set dow