66 A LABORATORY MANUAL OF BOTANY 
LESSON XXXIII 
Field study of the Algese? 
Region.—Locate pools of water, some of which are ex- 
posed and some shaded; a stream in which the water in 
some parts runs slowly, and in other parts rapidly; along 
the stream some damp banks, stones, or tree trunks; an old 
drinking-trough used by cattle or horses. 
Examine these places to find Alge. In the quiet water 
they are frequently found floating in masses; in running 
water, and sometimes in quiet water, they are found at- 
tached to various objects, as stones and sticks; in the drink- 
ing-troughs they appear as slimy coatings upon the wood; 
where the earth is damp, they are often on sticks and bark 
of trees, and also are found frequently growing in blue- 
green jelly-like balls. 
Carry into the laboratory in bottles or jars representa- 
tives of all the Alge found. Place them in the laboratory in 
as nearly normal conditions as possible, and try to get them 
to grow. They may serve for future study. 
Write notes describing where the Alge were found, their 
appearance, whether large or small, whether upon surface of 
water, deeply submerged, or on ground; free or attached ; 
coarse or fine, slimy or granular; in shade or direct expo- 
sure to light; include anything else that will give an idea 
concerning the Alge observed. 
LESSON XXXIV? 
The single-celled Algee 
Materials.—Pleurococcus as a type. Any good unicel- 
lular form will answer for this work, provided the one men- 
tioned is not easily found. 
1 This lesson may be used by the entire class or by one or more 
pupils working separately. 
2 Jt is assumed that the exercise on the plant-cell as outlined in 
the early part of the book has been studied. 
