ROTATION OF CEOPS. 31 



amateur cultivators are lacking, it is in having a liberal 

 supply of manure, the very corner-stone of all gardening 

 operations. It is therefore of the first importance to know 

 how to make the most of it. 



ROTATION OF CROPS, 



The necessity of the rotation of crops was long ago 

 recognized, and was supposed to arise from the plants 

 giving out excrementitious matters from their roots into 

 the soil, and so poisoning it. But it is now found that 

 plants give out but little of such matters, and that the 

 necessity of rotation principally arises from the plants of 

 any particular class exhausting the soil of those substances 

 which are necessary for their own particular nourishment, 

 no two classes of plants requiring the same combination of 

 substances for their particular support. Mr. Bridgeman, 

 in his " Young Gardener's Assistant,' 7 has so tersely given 

 instructions on this point, that we here subjoin them. 



Fall spinach is an excellent preparative crop for beets, 

 carrots, radishes, salsify, and all other tap as well as 

 tuberous-rooted vegetables. 



Celery or potatoes constitute a suitable preparation for 

 cabbage, cauliflower, and all other plants of the Brassica 

 family; as also for artichokes, asparagus, lettuce and 

 onions, provided the ground be well situated for them. 



Lands that have long lain in pasture are, for the first 

 three or four years after being tilled, superior for cabbage, 

 turnips and potatoes, and afterward for culinary vegeta- 

 bles generally. 



Fibrous-rooted plants should bo alternated with tap or 

 tuberous-rooted ones, and vice versa. 



Plants which produce luxuriant tops, so as to shade the 



