BEAL ON FORESTRY PROBLEMS. 19 



47. In some fmv ])]ac('s ]>i*<'i»ai'e open roads and buni every year to 

 keep them clean, notinj,^ results. 



48. Make a few experiments on removing; or hiirninj^ the iubl)ish 

 where timber has been cut out, to show the cost, — to show wlictlicr it 

 is feasible or utier folly. 



4!). Study tlie stunted, slow growiiiji, little woody plants as repeatedly 

 killed above ojround by fire; see their growth after all tries have been 

 removed. 



50. Exjieriment with the common locust in various jdaces and under 

 varying conditions to learn how to prevent the depre<hitions of the 

 borers. 



51. Test chestnut trees for thrift in many places and under varying, 

 conditions. 



52. Test any American trees not found in the State in several places 

 and grown under various conditions to possibly find some that are 

 profitable to grow in Michigan. 



53. Experiment with perlia])S thirty or more species and shrubs to 

 learn which are best to use as nurse trees to shade the ground in a 

 forest. 



54. Observe trees that have vertical splits and their attempt to heal. 

 What are such trees? Under what conditions are thev most liable to 

 split? 



55. Find out what they are and compare trees that split at the forks; 

 or crotches; also w'hat trees break most by snow and sleet. 



50. Compare trees of any species of varying ages to note how rapidly 

 they must usually grow to be liable to recover from injury. 



57. Study and compare many trees, noting the successes and failures 

 in repairing wounds from decaying limbs and other causes. 



58. Seek to find the sources of all possible injury to all sorts o"f trees 

 and the preventives. Why are there so few pine trees to any acre? 



59. Compare the specific gravity of any kind of wood grown in different 

 parts of the State on sand, clay, or rich loam. 



60. Test the weight, strength and durability of wood taken from 

 different parts of an oak or arbor-vitae. 



01. Compare the length and size of fibres of au}^ broad-leaved tree or 

 tracheids of cone-bearing tree, at different ages or periods of growth. 



02. Where land is to be cleared, estimate carefully how^ much timber 

 of difl'erent grades occur to a certain measured area, and then see how- 

 it comes out. 



03. Years of work can be profitably employed in comparing the struct- 

 ure of wood of different kinds at different ages, with tlie view of 

 learning its physical peculiarities and adaptability for certain uses. 



64. Compare the tops of fifty trees of any species that have grown in 

 the open with each other, noting whether the shapes change as the 

 trees become larger. 



05. Compare trees of either s]>ecies grown in the open with trees of 

 the same species grown in the forest. 



06. Note and record the easiest popular points for identifying each 

 species of tree as seen in winter, as seen in summer. 



07. W^hich species of trees hold their leaves on low branches in a 

 dense forest; on which species are the lower limbs naked? 



