84 On the Inorganic Constituents of Plants, 



No. 7. Not manured at all. The produce was 



No. 8. Manured with Sulphate of Lime at the rate of 4y cwt. 

 per acre. The produce was 



No. 9. Manured with Sulphate of Ammonia, at the rate of 3 cwt. 

 per acre. The produce was 



No. 10. Manured with Sulphate of Magnesia at the rate of 

 3 cwt. per acre. The produce was 



No. 11. Manured with Sulphate of Potash at the rate of 3 cwt. 

 per acre. The produce was 



Dry haulm 3* 4 96 



No. 12. Manured with Nitrate of Soda at the rate of 3 cwt. per 

 acre. The produce was 



The proportion of tubers is by no means what might have been 

 expected from the apparent size of the plants ; there was very little 

 difference perceptible between the plants manured with the three 

 salts of Ammonia, the plants were equally healthy and no difference 



