A STUDY OF THE INTERRELATIONS BETWEEN 

 BIRDS AND FOREST VEGETATION 



Materials required for trip : — Laboratory Directions, rough 

 note paper, pencil or pen. 



This study is based upon a field trip to the University of 

 Illinois Forestry. The same outline is adaptable for a field trip 

 to any sort of a planted grove or to fence rows where the veg- 

 etation is allowed to grow. 



Rough notes are to be taken in the field. Later these are 

 to be written up in the form of a connected report which is to 

 be organized under the following headings : 



I. Introduction. 



II. Facts observed and Inferences. 



III. Conclusions. 



The Introduction should bring into relation all information 

 considered necessary for an understanding of the observed facts. 



A. Suggested Materials For Introduction 



1. Aim of this study : An appreciation of the work of birds 

 as agents in the distribution of vegetation and the effects of their 

 work upon the plant and animal life of a region. 



2. Before 1871 there were no trees of any sort in this plot 

 now known as the University of Illinois Forestry. Originally 

 there was a dense growth of grasses and low type of vegetation 

 characteristic of the prairies but tliis sod was broken and the 

 ground was put under cultivation for a considerable number of 

 years before the first trees were planted. Since the breaking of 

 the sod and the planting of the first trees by man in 1871, there 

 have been many agencies at work bringing about changes in the 

 plant and animal life of the region. 



One of the important agencies in bringing in new kinds of 



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