bodies of various composition. They are made up of cells with densely
and coarsely granulated reddish colored contents--shape, size, and
composition are very variable, as shown in the figures. _The cellular
bodies make up the essential organic part of the clayish substance, and,
without any doubt, if anything of the organic compounds of the substance
is in genetical connection with the disease, these bodies would have
this role_. The structure and coloration of cell contents exhibit the
closest alliance to the characteristics of the division of Chroolepideae
and of this small division of Chlorophyllaceous Algae, nearest to
Gongrosira--a genus whose five to six species are inhabitants of fresh
water, mostly attached to various minute aquatic Algae and mosses. Each
cell of all the plants of this genus produces a large number of mobile
cells--zoospores.

Fig. 9 represents very probably one zoospore developed from these plants
as figured from 10 to 16.

* * * * *




CARBON.


M. Berthelot, in the _Journal de Pharmacie et de Chimie_ for March,
states that from peculiar physical relations he is led to suspect that
the true element carbon is unknown, and that diamond and graphite are
substances of a different order. Elementary carbon ought to be gaseous
at the ordinary temperature, and the various kinds of carbon which