THE FLORAL WORLD AND GARDEN GUIDE. 19 



The Bedford variety is more upright in habit, and less downy, 

 although very pretty, and makes fine speeimeu trees. The Come- 

 well or Seaside variety is not so fine in form or foliage, but is better 

 adapted for some purposes than the others. The former are fresh- 

 water willows, while this is a salt-water variety, and is therefore 

 most useful for planting iuour islands. If an entire line were planted 

 between the sea and the land, and cut over at different heights, and 

 thereby caused to stool out — or even if a double or triple line were 

 thus planted and topped, it would form an excellent guard against 

 sea-spray and high winds. Also, where a few are dotted through 

 the regular planting, they shelter and nurse the plantation wonder- 

 fully. 



In the above list of ornamental trees, I have entered none but 

 such as I think are strictly suitable for the purpose, and, at the 

 same time, useful. The pines I have not considered it necessary to 

 particularize as to colour of foliage. The whole are ranged according 

 to the best of my judgment; and if the paper should be considered 

 serviceable in some degree in promoting a higher style of landscape 

 ornamentation, and thereby further one of the many laudable 

 objects of the Highland and Agricultural Society, I shall feel 

 satisfied. 



LIME-KILN HEATING. 



ITHIN" a comparatively recent period a system of heating 

 plant and fruit-houses has been brought into notice, and 

 has received a considerable amount of attention from 

 horticulturists and others interested in economizing 

 fuel. The system consists of a combined lime-kiln and 

 hot-water apparatus, the former being subsituted for an ordinary 

 furnace. The advantages of the system are said by the inventor, 

 Mr. Cowan, to consist in reducing the labour of attending to the 

 fires very materially, and in saving a very considerable portion of the 

 cost of the fuel, for he in fact asserts, that the value of the lime 

 produced in a given period will be equal to the value of the fuel 

 consumed in producing it. As yet we have no means of ascertaining 

 how far this assertion is borne out by facts, but as an apparatus has 

 been recently fixed to heat several large houses in the gardens of 

 the Marquis of Salisbury, at Hatfield, we shall soon be able to obtain 

 reliable information upon the point. The furnace is built in much 

 the same manner as an ordinary lime-kiln ; a saddle boiler, or one of 

 a similar shape, is fixed upon the top, and from this the pipes radiate 

 as from a boiler fixed over an ordinary fire-place. A great depth of 

 stoke-hole is therefore necessarily required, and sufficient space 

 must also be provided for the storage of the lime after it has been 

 burnt, as well as for the coal used in its production. The success of 

 the system depends entirely upon the truth of the assertion that 

 lime-stone and chalk when heated by means of fuel to a certain point 

 become independently incandescent, and give out more heat than 

 they have taken from the fuel to raise them to the proper tempera- 

 January. 



