EXPERIMENTS WITH REFERENCE TO THE POTATO DISEASE. 



57 



only Si per cent., whereas in the preceding experiment, differ- 

 ing only from the one under consideration in the plants not 

 being earthed up, the proportion diseased was upwards of 21 per 

 cent. On the average, therefore, it would appear that the earth- 

 ing up had diminished the amount of diseased produce fully 18 

 per cent., wliilst the amount of sound produce was increased at 

 the rate of 1 ton 5 cwt. 5 lbs. per acre. 



Table IV. — Results of Experiments with Jersey Blue Potatoes, 

 planted whole, in hills, each hill occupying one square yard. Com- 

 position of potash, fat, common salt and water applied to the Sets ; 

 Plants lajered and earthed-up repeatedlij. 



