110 LABORATORY LESSONS IN GENERAL SCIENCE 



to recognize elm flowers, and be sure to verify what is shown 

 in the pictures. 



7. To what uses is elm wood put other than for fuel? 

 What is its relative value for lumfeej? Discuss how the 



S" ' v 



cutting of the forests of the United States Tias contributed 

 to the high cost of living. 



8. Arrange alphabetically in a column a l ; ist of five or 

 more shade trees known by you. In like manner in other 

 columns, write (a) the names of five fruit trees ; (b) the names 

 of five trees of which you have read or heard, but which 

 otherwise are unknown to you. 



9. After such instruction as may be needed in the use of 

 the "Key" in Farmers' Bulletin No. 468, make use of your 

 copy as you come and go outside school to verify your list 

 of shade trees, employing it with different trees of the same 

 kind till you are perfectly familiar with the distinctions it 

 makes. 



State what you have noted of different trees of the same 

 kind as to form and general appearance even when age and 

 conditions of growth are much the same. Note, too, that there 

 are varieties of the same kind of tree, e.g., there are several 

 different kinds of elm with marked characteristics that in- 

 variably distinguish them. 



10. In a tabulated form suitably arranged under appro- 

 priate headings, write in lines opposite each of the five shade 

 trees named in paragraph 8 the characteristics of each 

 kind of tree. (Write lengthwise of the page, and so that 

 the same items for all trees fall in the same column.) This 

 makes it possible, by following down a column, to note the 



