Guss GARDEN NATURE-STUDY 251 



into in early spring when the ''sap is running" to where the blossoms 

 and leaves are to be formed ? — Sugar. 



For Grade 6 {May be started in Grade 5) 

 How New Bulbs are Made 



In what other way (besides producing seeds) do bulb plants 

 provide for increasing the number and continuing the life of their 

 kind? 



How and where and when are new bulbs produced? 



Where is the food to be stored in them obtained and prepared? 

 How? 



Review such parts of the lessons for Grades 1 to 5 as have not 



been taught and are needed to imderstand the following. 

 Observations: 



Have children observe vertical sections of bulbs that have been 

 growing for some time (keep them watered and in the light) since 

 they bloomed and that have healthy green leaves. 



Find new bulbs forming. Where? Draw. 



Test for starch (See Exp. I). 



Other foods stored in bulbs and in other thickened parts of 

 plants are — sugar (sugar beet), proteids (material to build living 

 protoplasm) . 

 Experiments. (How Leaves Help) 



The following experiments will show where bulbs and other 

 plants get and prepare some of their food; also other important 

 things about plant activities. 



Exp. 2. — ^Why plants must have light and air and how in getting 

 scm-e of their food they purify the air. (Suitable for upper grades.) 



Fill two wide-mouthed bottles (pickle bottles or small fruit jars 

 will do) with water, insert in one (top first) some fresh bulb leaves or 

 a cutting from a plant such as geranium, begonia, etc., and invert 

 the bottles in a basin, or pan one-third full of water. 



By means of a straw 01 a piece of macaroni inserted under the 

 edge of the bottle, fill each with air which has been held in the 

 lungs as long as possible (it may be necessary to dip some of the 

 water out of the pan). 



Set the pan with the bottles or jars in the sunshine for a day 

 or two. See test (h) below also. 



Then make the following tests : 



(a) Remove the cutting while the mouth of the bottle is stfll 

 under water, place a piece of greased window glass or other tight- 



