Rear-Admiral Hornby, of Knowsley Cottage, Prescot, Lancashire, has forwarded to us a table, giving the results of a trial of various sorts of Potatoes, in which the comparative productiveness of seed obtained from other localities was tested against that which had been grown in the neighbourhood. By a reference to the table, it will be seen that one column contains a list of twelve varieties, the sets of which had been grown at Knowsley Cottage. The other column contains a list of twenty varieties, the sets of which had been obtained from a distance - those marked with an asterisk having been obtained from Southampton last spring. A comparison of the relative produce given exhibits an extraordinary result in favour of a change of seed, especially in the case of some of the varieties - such as Yorkshire Hero, Early Emperor, Daintree's Kidney, Dawe's Matchless, Waterloo Kidney, Early American Rose, Breese's Prolific, and The Queen; the highest relative produce coming from Daintree's Kidney, in which instance 3 1/2 lb. of Potatoes realised nearly 200 lb. In the first list we are pleased to see that Veitch's Improved Ashleaf, a first-rate new early Kidney of superior quality, takes a high place.

In a note accompanying the table, the gallant Admiral states that all the kinds were "treated exactly alike, and were grown alongside each other in light soil, what we call in this country 'moss' soil;" but what his particular mode of culture was he unfortunately omits to state.

Potatoes 1870.

Old Seed.

Produce

Early Coldstream,

3 1/2 lb.

43 3/4

lb.

Transell's Seedling,

.

,,

63 3/4

,,

Veitch's Improved Ashleaf

,,

112

,,

Lemon Kidney,

.

,,

50 1/2

,,

Mona's Pride,

,,

46 1/2

,,

Little Green Kidney,

.

,,

46 1/4

,,

Daintree's Seedling,

,,

71

,,

Early Oxford, .

.

,,

86

,,

Ready Penny, .

.

,,

62

,,

Regent (Paterson's),

.

,,

77 1/2

,,

Milky White, .

.

,,

61 1/2

,,

Royal Ashleaf, .

.

,,

57 3/4

,,

New Seed.

Produce.

*Gryffe Castle Seedlin

34 1/2 lb.

65

lb.

* Yorkshire Hero,

,,

124 1/2

,,

* Scotch Blue, .

.

,,

48 3/4

,,

* Wormsley Kidney,

,,

75 1/2

,,

* Redbridge Ashleaf,

.

,,

71

,,

* King of Flukes,

.

,,

79

,,

* Early Emperor,

,,

140 1/4

,,

* Alexandra,

,,

73 1/2

,,

* Daintree's Kidney,

,

,,

199 1/2

,,

*Gloucestershire Kidney

,,

52 1/4

,,

* Dawe's Matchless,

,,

157 1/2

,,

* Wellington,

,,

88 1/2

,,

Early Coldstream,

.

,,

71 1/4

,,

Webb's Imperial Kidney

,

,,

122 1/2

,,

Harris's Nonpareil,

,,

77 3/4

,,

* Waterloo Kidney,

.

7 lb.

138 1/2

,,

Early Rose,

.

,,

267 3/4

,,

Breese's King of the Earlies

3 1b.

71

,,

Breese's Prolific,

,,

137

,,

The Queen,

.

,,

115 1/2

,,