6 A LABORATORY MANUAL OF BOTANY 
washed without damage. They should contain drawers in 
which laboratory drawings and notes and the smaller pieces 
of apparatus may be kept. The accompanying figures illus- 
trate two types of tables, either of which is good. The one 
shown in Fig. 1 is designed to stand with one side against 
the wall, so that the student may face the light. The one 
shown in Fig. 2 is designed for rather crowded laboratories, 
and with one end of the table placed toward the light it will 
seat four persons. The lockers on the rear side may be 
omitted, when it serves well for two students, both facing 
the light. These tables are good, not expensive, and can 
be built by any capable carpenter. Much cheaper tables, 
without lockers, can be obtained, and a few of these should 
always be kept in the room, serving as convenient places 
for keeping jars of growing specimens. 
(b) Cases and shelves—An ample supply of cases or 
shelves, where jars, bottles, and herbarium materials may 
be placed, helps very much to make the laboratory con- 
venient and orderly. 
(c) Plant boxes and aquaria.—There is little danger of 
having too many growing plants in any room where botany 
is studied. Boxes, pots, and glass jars should be supplied 
in abundance. Some of the jars should be large enough 
to make possible the growth of a few of the flowering water- 
plants, as well as the lower forms. Large cement tanks for 
this purpose can be constructed without much difficulty. 
It is necessary to supply all water-plants frequently with 
fresh water, as well as to see that they are properly aerated. 
This may be done by allowing water to drip into the ves- 
sel, or even better by placing in it some small animals. 
(d) Glassware—A few large bell jars will be found 
serviceable for covering small plants. Fruit jars and a 
number of small, wide-mouthed bottles are indispensable 
for collecting and preserving materials. Bottles contain- 
ing 100 cubic centimeters and 200 cubic centimeters are 
