GR A 



270 



GRE 



sized marbles, and about one-fourth of 

 it must be much smaller. If a portion 

 of clay is by nature or art incorporated 

 with the gravel, it will bind more firmly, 

 and present when rolled a more com- 

 pact and even surface. 



The following is an excellent plan to 

 make or turn gravel walks in d ry weather. 

 If of a sandy or gravelly nature strew a 

 little clay or marl upon the walks. When 

 turned ovei take away all large stones, 

 and place them at the bottom of the 

 mass. Immediately after you have le- 

 velled the walk apply the roller, and let 

 an assistant follow, pouring upon it wa- 

 ter from a watering pot with coarse rose ; 

 in twenty-four hours after, if the wea- 

 ther is dry, it will be as solid as a stone 

 floor. The writer has had ocular de- 

 monstration of the fact in twenty in- 

 stances in the driest weather. — Gard. 

 Chron. 



The best method of extirpating grass 

 which springs up from beneath a gravel 

 walk and spreads over its surface, is to 

 break up the walk, and pick out care- 

 fully all the under-ground runners which 

 may be met with. Where it is not de- 

 sirable to disturb the walk, the best 

 way is to spread salt in considerable 

 quantities over its whole surface ; and 

 if after the first application it is found 

 that portions of the grass still exist, let 

 another coating of salt be applied, 

 which will effectually destroy it. Care 

 must be taken, however, if the walk 

 is edged with box, that the salt does 

 not come in contact with it, otherwise 

 it will destroy the edging also. 



" In the early part of April, gravel 

 walks are usually turned ; and practice 

 has taught that there is a right as well 

 as a wrong way, even for the perform- 

 ance of this simple operation. After 

 the walk has been broken up and level- 

 led, and a facing of new gravel spread 

 over, this ought to be left for three or 

 four days, and until a shower of rain 

 has fallen, before the roller is used. 

 This bleaches the gravel, and washes 

 down the fine particles, so that, imme- 

 diately after rolling, the walk is solid, 

 and has a clean bright surface." — Gard. 

 Chron. 



Dr. Lindley has proposed a substi- 

 tute for gravel in the construction of 

 walks, which will get rid of most of 

 the annoyances attendant upon gravel; 

 for, formed of this material, they will 

 never be troubled by worms or weeds, 



and will never require rolling. They 

 may be made of the same arched form ; 

 and if, at the time of making, the surface 

 be sprinkled with fine bright coloured 

 gravel, they will be as handsome as if 

 formed entirely of that material. 



The composition recommended must 

 be made and laid down in perfectly dry 

 weather. 



" Procure a quantity of road-sand, or 

 similar powdery material — finely sifted 

 lime-rubbish will do — and let it be tho- 

 roughly dried, so that it feels like dust 

 when handled : also sift out of the cinders 

 from the dwelling-house, &c., the finer 

 parts, and let these be also made per- 

 fectly dry ; mix these carefully, two 

 parts road-sand to one of ashes. In a 

 dry place, on a dry day, spread a quan- 

 tity of the mixture, as a bricklayer 

 spreads his lime, with a hollow in the 

 middle. Into this hollow pour some 

 coal-tar, boiling hot. Incorporate the 

 whole with a shovel, as if making mor- 

 tar, and when a thick paste, spread it 

 three or four inches thick over the 

 ground, laid out for the walk or floor. 

 The ground should previously be beaten 

 down as firm and as level as possible. 

 Powder it all over with dry and rather 

 coarse sand, after which a few passages 

 of the roller wiH press it level. Leave 

 it for a few days to harden, after which 

 the walk is fit for use, and will last for 

 very many years." — Gard. Chron. 



GREAT BURNET. Sanguisorba. 



GREAT CENTAUREA. Centaurea 

 centaurium. 



GREEN-HOUSE. This is a winter- 

 residence for plants that cannot endure 

 the cold of our winter, yet do not re- 

 quire either the high temperature or 

 moist atmosphere of a stove [i. e. hot- 

 house] . 



" The first thing to be attended to in 

 its construction," says Mr. H. Fortune, 

 of the Chiswick Gardens, " is the choice 

 of a proper situation. South is the best 

 aspect, or as nearly that as possible : 

 south-west or south-east will do, or even 

 east or west ; but on no account should 

 it ever face the north. Green-houses 

 should be fixed in situations where they 

 will not be shaded from the sun by any 

 part of the dwelling-house, or other 

 buildings, and should also be quite free 

 from large trees. They should not 

 be placed near trees for another reason 

 than being shaded by them, namely, 

 the glass in the roof being apt to be 



