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HIGHER BLUE GREENS 167 
their component cells other reproductive bodies (hormo- 
gones) are formed. 
230. On account of their minuteness, bacteria may be 
picked up by currents of air and borne long distances, 
and in this way they are doubtless often carried from 
place to place. When a pool of putrid water dries up, 
the bacteria with which it swarmed are blown away with 
the dust and dirt, dropping everywhere into pools, upon 
plants and animals living and dead, and even entering 
our lungs with the air we breathe. 
Cuass 2. HOLOPLASTIDEAE 
Tue HicuHer BuuE GREENS 
231. This little class, of about 20 species, includes 
Slime Algae, in which the nucleus is defined by a nuclear 
membrane, and the coloring matter is concentrated in 
one or more plastids. There is but one order, the 
Glaucocystales, and a single family (Glaucocystaceae) of 
unicellular plants. The type genus is Glaucocystis. 
Laboratory Studies of the Myxophyceae. With the fore- 
going general statements of the structure and life of the Slime 
Algae including the Bacteria, the student must now make some 
examination of them by means of a good compound microscope 
in the laboratory. In his examination he should make careful 
drawings accompanied by brief, necessary descriptions. It isa 
good rule in the study of plants never to make a needless draw- 
ing, nor write an unnecessary description. A second rule of still 
greater importance insists upon the absolute truthfulness (ac- 
curacy) of both drawings and descriptions. 
The following studies are suggested as useful. 
(a) Scrape off a little of the greenish slimy matter from a 
damp wall, mounting it in water; examine under a high power. 
Some small blue-green or smoky-green cells will be found 
belonging to the Blue-green Slimes (Chroococcus, etc.); of 
