. The microscope and its revelations. ted process which we shall presently meet with in the Florideseor Rhodospermese, the highest class of Alga?. Among the highest of the Alga? in regard to the comph-xitv oftheir generative apparatus, which contrasts strongly with the generalsimplicity of their structure, is the family of Characeae,- somemembers of which have received a large amount of attention frommicroscopists on account of the interesting phenomena they plants are for the most part inhabitants of fresh waters,and are found rather in. such as are still than in those whichare
. The microscope and its revelations. ted process which we shall presently meet with in the Florideseor Rhodospermese, the highest class of Alga?. Among the highest of the Alga? in regard to the comph-xitv oftheir generative apparatus, which contrasts strongly with the generalsimplicity of their structure, is the family of Characeae,- somemembers of which have received a large amount of attention frommicroscopists on account of the interesting phenomena they plants are for the most part inhabitants of fresh waters,and are found rather in. such as are still than in those whichare in motion : a few species, however, may be met with inditches whose \\atcr> are rendered salt by communication with thesea. They may be easily grown for the purposes of observation in 1 Sirodot, Lcs BatracJiosprrniees, fo. 1884. 2 [Many of the best authorities regard the Characeer, in consequence of theirmode of reproduction, as a group of primary character, of equal rank with the Algee,and superior to them in organisation.—ED.]. FK;. nioniliforme. 5/6 MICROSCOPIC FORMS OF VEGETABLE LIFE—THALLOPHYTES large glass jars exposed to the light, all that is necessary being topour off the water occasionally from the upper part of the vessel(thus carrying away a film that is apt to form on its surface), andto replace this by fresh water. Each plant is composed of anassemblage of long tubiform cells placed end to end, with a distinctcentral axis, around which the branches are disposed at intervalswith great regularity (fig. 434, A). In Nitella the stem andbranches are composed of simple cells, which sometimes attainthe length of several inches ; whilst in most species of Chara eachcentral tube is surrounded by an envelope of smaller ones, which isformed as in Batrachospermum, save that the investing cells growupwards as well as downwards from each node, and meet each otheron the stem halfway between the nodes, their ends dovetailinginto one another. These inve
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