HARMFUL EFFECT OF SOLANINE 



255 



before, and then allowed to cool and aerate. The control in 

 soil extract as nutrient solution, was heated in the same manner 

 so as to have all conditions alike except the presence of solanine. 

 For each treatment three cultures were grown. The plants were 

 put in fresh solution every three days. The experiment was 

 conducted from October 7 to November 10. The treatment and 

 green weights are given in Table 1. 



Fig. 1. Showing the harmful effect of Solanine on potato plants, 

 tract with Solanine; 2, Soil extract without Solanine. 



1, Soil ex- 



The solanine proved to be harmful in each of these tests. 

 With the good soil extract as the nutrient solution the growth 

 was reduced from 6.82 grams to 2. 33 grams, a decrease of 66 per 

 cent, and with the poor soil extract from 4.60 to 1.83 grams, 

 a reduction of 60 per cent. The growth in the good soil extract 

 with and without solanine is shown in figure 1. 



