36 



STUDIES IN THE VEGETATION OF THE STATE 



tors. The relative amount of light in each of the above loca- 

 tions on March 31 may be expressed by the following ratios : 



(Light amount) I : (Light amount) II :: 1 : 1.583 

 (Light amount) I : (Light amount) III :: 1 : 1.250 

 (Light amount) I : (Light amount) IV :: 1 : 1.500 



On June 6 the light relations between the four locations 

 were as indicated : 



(Light amount) II 

 (Light amount) III 

 (Light amount) IV 



220 



5 



32 



(Light amount) 1 

 (Light amount) I 

 (Light amount) I 



The following light ratios obtained September 8 and Novem- 

 ber 3, respectively : 



I : (Light amount) II :: 1 : 100 

 I : (Light amount) III :: 1 : 4 



I : (Light amount) IV :: 1 : 12 



(Light amount) 

 (Light amount) 

 (Light amount) 



(Light amount) I 

 (Light amount) I 

 (Light amount) I 



(Light amount) II 

 (Light amount) III 

 (Light amount) IV 



2 

 1.3 

 2.6 



In every location results clearly indicate more light at 

 the height of one meter than at the earth's surface. It is 

 more than likely that considerable error will be found in 

 thicket and deep woodland factors owing to the length of 

 time required to sufficiently blacken the paper, but, after 

 allowing for all possible error, the facts remain materially 

 unchanged. 



The thicket formation from which the light factors were 

 obtained is a veritable jungle of Xanthoxylum, Corylus, 

 Cofnus, and Prunus, sparingly interspersed with Ulmus, 

 Robinia, Glcditsia, and Crataegus. Rhus glabra and Ribes 

 gracile with Menispermum as a climber are common along 

 its borders, and in many places it is overgrown with Vitis, 

 Parthenocissus, and Sniilax. It is worth while to note the 

 iSpecies of herbaceous plants growing in this thicket, also 

 their flowering period. Viola obliqua, Y. scabriuscula, Ery- 

 thronium albidum, Bicuculla cucullaria, Carex grisea, G. 



