150 LABORATORY LESSONS IN GENERAL SCIENCE 



13. How is cider vinegar made ? How may this change be 

 prevented, and the cider be kept sweet? What household 

 uses has vinegar ? How is apple jelly made ? 



14. In apple raising on a large scale, why is there need 

 (a) of good business ability ; (6) of considerable capital ? 

 What degree of intelligence is required to make fruit-raising 

 a success? 



WHEAT, AND WHEAT GROWING 



(a) In the Field 1 



1. About what height has the wheat 

 plant as found in the field at the time of 

 this lesson ? About what will be its height 

 when ready for the harvest? What ad- 

 vantages in the hollow growth of the 

 stems as regards (a) the time that would 

 be required for growth to the same size if 

 solid; (6) the strength of a solid stem 

 having the same amount of material ? 



2. Examine a growing wheat plant to 

 discover if every stalk is from a separate 

 kernel sown. What is meant by the 

 "stooling" of wheat? Note how far 

 below surface the crown of the wheat 

 root grows. What advantage is there 

 to the plant growth in this? 



3. Dig carefully about a wheat plant 

 FIG. 68. The "stool- and ascertain to about what depth the 



ing " of grain. 



roots grow. , 



1 Any field studies of growing wheat must of course be arranged to suit 

 local conditions. See footnote under Temperature Records. 



