30 



The Ohio Journal of Science [Vol. XIX, No. 1, 



unexpected lines, so that objects which at the beginning were 

 included merely incidentally turn out to be of first importance. 

 Station 17, for example, (see page 26) was located for the purpose 

 of recording the return of vegetation in the foreground and no 

 special attention was paid at the time of its establishment to the 

 condition of the mound in the background. There was no 

 change in the special ground designated as the station until two 

 years had elapsed, but a striking invasion occurred the following 

 year in the background, a detail which is reproduced on page 27. 



Photograph by R. F. Griggs 



SEEDLINGS OF RUBUS SPECTABILIS AND CHAM^NERIUM 



AUGUSTIFOLIUM. 



Starting in the ash beneath the shelter of the spruce trees whose needles cover 

 the ground. 



After this had taken place, it was found possible to go back to 

 the first photograph and identify every one of the clumps of 

 grass which sprang up so conspicuously the following year, 

 ascertaining exactly what had happened as accurately as though 

 a complete census of the area had been taken in the first place. 

 (6) Beside providing much better records, photographic meth- 

 ods are much more rapid and, therefore, much less expensive 

 than platting. This may not be apparent to one who does his 

 work near home in vacations, but where considerable sums 



