QUARTERLY CHRONICLE. SF 
(8) The old ideas concerning the vibratory movement of 
the antherozoids in the Floridez arose most likely from con- 
fusing them with the zoospores of epiphytic Chytridia. 
(9) Two principal types are united in the Alge, which, 
commencing with their lowest homologous forms, differ more 
and more in their higher stages of development, and are most 
easily characterised by the presence or want of swarm-cells, 
which are moved by flagella or vibratory cilia. ‘The first 
order commences with the Chroococcacez, to which the Bac- 
teria and Oscillariz, and to which the Vibriones belong, as 
also Nostocacez, Rivularie, Scytoneme ; thus finishing with 
LIyngbya and Lirosiphon; Bangia belongs to the Floridee, 
and, through the Collemacez, is connected with Lichens (As- 
comycetes). ‘The propagation-cells of all of them are with- 
out organs of movement; the colouring-matter, as a rule, is 
not pure green, but generally composed of chlorophyll and 
another separable body. 
The second order begins with the Protococcacez, includes 
the Chlorosporezee, Phzeosporeze, Fucacez, and finishes by 
connecting itself with the Mosses through the Characeee. In 
this division, in which either the whole or only the asexual, 
or only the male reproducing-cells are provided with whips 
(flagellatee) or cilia (ciliate), the colouring-matter is either 
a pure chlorophyll or else a red or brown modification of that 
body. 
(i0) Since among the colouring-matters of those Alge which 
are not green in colour, phycochrome and rhodophyll both 
contain a large amount of chlorophyll in their composition ; 
and since also the brown colouring-matter of the diatoms 
Pheeospores and Fucacez, as well as the scarlet oil (heemato- 
chrome) of chlorospores, seem merely to be modifications of 
chlorophyll, we may say that chlorophyll is the means of 
carrying on the process of assimilation in all developing 
lants. 
(11) The movement of the Oscillariz depends on three 
facts :—I1st. A steady but changeable rotation around the long 
axis of the plant. 2nd. The power of being able to push 
itself variably backwards and forwards. 38rd. The power of 
being able to bend, to stretch, and to twist, or, in one word, 
its flexibility. 
(12) The reason of the rotation has not yet been disco- 
vered. The forward motion seems, as in the wheels of a 
carriage, to come from the revolving movement through 
pressure on the substance which supports the Oscillaria, be- 
cause the Oscillaria, as a rule, are never able to move forwards, 
except when they have some surface for support, such as a 
