PROBLEM 84 



99 



If you go to school 

 in New York city use 

 this diagram for your 

 notebook. 



Conclusion. — If a 

 trip is taken, write 

 out carefully a report 

 of the observations 

 made. 



Problem 84: To 



identify common 

 trees by the use of a 

 key. 



Materials. — Vari- 

 ous specimens of wood 

 with leaves on twigs ; 

 pictures of trees, flow- 

 ers, and fruits ; ruler. 



Method and Obser- 

 vations. — Using the 

 material and the Key 

 on the following pages 

 under the supervision 

 of your teacher, make 

 careful observations 

 of leaves given you. 

 Note and measure 

 size of leaf, structure, 

 shape, etc. Refer to the Key which follows. Determine whether 

 the specimen which you have belongs under A or B. If it belongs 

 under A, for example, then place it under I or II. Having done 

 this, determine whether it is a, b, or c, then 1, 2, or 3, etc., 

 until you finally determine the specimen of leaf, and by it, the 

 name of the kind of tree to which it belongs. 



Conclusion. — -What are the names of the various trees from 

 which you have made observations? 



A Diagram of the Hall containing the Jessup 

 Collection of Woods, American Museum of 

 Natural History, New York. 



