FORMATION OF THE WINTER LEAF BUD. g^J 



Of the fossil manures lime was included in the first divi- 

 sion, and coal ashes were classed with those of wood and 

 peat, so that only two remain. 



1. Salt. 

 Little is known of this at present. In too large a quantity Salt. 

 it is injurious. It is certainly beneficial when properly ap- 

 plied. Perhaps it is best when mixed with dung or compost. 



, 2. Gypsum, 



Many persons assert; that this is no manure ; others, that 

 it is almost uniformly advantageous. It is said, to act as an 

 immediate manure to grass, and afterward in an equal de- 

 gree to grain: to continue in force for several succeeding 

 crops : to produce an increase of vegetation on stiff clay 

 soil, but not sufficient to pay the expense: to be beneficial 

 to flax on poor dry sandy land : to be particularly adapted 

 to clover in all dry soils, or even on wet soils in a dry season: 

 aud to have no effect in the vicinity of the sea. 



Of Composts. 



These Mr. Young considers in the same light with dung- Composts, 

 hills: he is of opinion, that the materials composing them 

 would produce at least equal if not superior effect when ap- 

 plied to the land directly. 



XV. 



On the Formation of the Winter Leaf Bud, and of Leaves. 

 By Mrs. Agnes Ibbetson, 



To Mr. NICHOLSON. 

 SIR, 



JL OUR obliging notice of my former papers has embol- Use f th b d 

 dened me, to trouble you again. There is no part of a plant not yet known, 

 or tree more various in its formation, and in its conse- 

 quences more astonishing, than the gemma, or bud. In spite 



of 



