Further Experiments on the Cultivation of Potatoes. 157 



The trials of 1831 gave rise to further experiments with regard 

 to the space between the sets. Accordingly, in 1834, another ex- 

 periment was made, for the purpose of ascertaining the most 

 preferable distance at which the sets of commonly cultivated 

 varieties should be planted ; and at the same time a repetition 

 was made of the comparison between whole tubers and single 

 eyes. The distances between the rows were 2£ feet, 2 feet, \\ 

 foot and 6 inches. The result with regard to distance, was, that 

 the crop was found to be greatest where the distance between the 

 rows was most in accordance with the height of the stems ; and 

 the most uniformly abundant produce was from rows 2 feet apart. 

 The comparison between vjhole tubers and single eyes was still 

 found to be in favour of the latter.* 



The experiments in the present season have been made with 

 regard to 



First, the time of planting ; first week in March, and first week 

 in April. 



Second, the sets ; whole tubers, bases, and points of tubers. 



Third, the depth ; 3 inches, 4 inches, 6 inches, and 9 inches. 



A piece of ground in the kitchen garden which was previously 

 in grass was trenched and planted with the Bread-fruit Potatoe, 

 a sort which for productiveness is perhaps unequalled near London 

 by any other of so fine a quality. The ground was divided very 

 exactly into six equal parts. Three of these were planted res- 

 pectively with whole tubers, bases, and points of tubers in the first 

 week of March ; the other three compartments in a similar manner 

 in the first week in April. The following table exhibits the 

 results, calculated for an acre. 



* See Transactions, Vol. L Second Series, p. 524. 



