14 lill.I.KTJX ^E." 



plied, and also where nothing had been applied. The photo- 

 graphs were all taken with a target rod placed, as a scale, di- 

 rectly in the center of the field arid in the front row of corn. 

 With this arrangement the photographs give a quantitative ex- 

 pression to the differences in growth of the corn. 



In Figs. 10 and 11, p. 15, are shown more distant views of 

 the com on the Miami^Loam and Norfolk Sand, which show 

 very clearly that the effects of the treatment are general lo the 

 field and sufficiently marked to be seen distinctly, even when 

 reduced to the small size of the Miami Loam view. In this 

 case the camera was stationed some 60 rods distant and yet the 

 rise and fall of the corn on the succession of plots is evident. 



The low corn in all cases marks the areas to which nothing 

 was added to the soil and the places of maximum height are 

 those where the 15 tons of manure had been applied. 



YIELDS OF POTATOES. 



The yields of potatoes, as has been stated, were much re- 

 duced through the effect of the more or less severe "tip-burn" 

 which developed after the tubers had been well set, and pro- 

 gressed Avith varying degrees of rapidity at the different sta- 

 tions. It had progressed so far and rapidly that at all stations 

 except Janesville the foliage became much reduced by the time 

 the tutors had attained not more than half of the normal size. 

 The result was the yields were determined by what transfor- 

 mation to and storage of starch could be accomplished under 

 the imperfect condition of the foliage. Up to the middle of 

 July a good growth of vines had been made and there was 

 promise, at that time, of good yields everywhere, but the ''tip- 

 burn" developed rapidly once it had started. 



There was, during the early stages of growth, the same 

 marked effect of the stable manure upon the vines as was shown 

 by the com and this can be seen in the foreground of Fig. 11, 

 p. 15, on the Norfolk Sand. There was also, just prior to the 

 development of "tip-burn" a well marked difference in the 

 amount of vine produced on the different soil types and there 

 is every reason to think that had the potatoes matured nor- 

 mally, the yields would have reflected the capabilities of the 



