T E R 



T E T 



portionaI)Ie width ; designed in gardens as a 

 Iiigh, airy walk, to command a better prospect 

 oi' the adjacent places around, within and with- 

 out the garden occasionally, as well as to enjoy 

 the fresh air in summer more freely. In the 

 former stvle of laying out gardens, it was con- 

 sideTcd as very ornamental, but is at present 

 nnicli in disuse. 



The height of a Tcrrace-walk may be more or 

 less as the situation admits, as from one foot to 

 one or two vards; or even three or four yards 

 or more in particular situations, and where there 

 are plenty of earthy materials, rubbish, &c. to 

 form it, allowing breadth in proportion, from 

 five to ten or twenty feet or more, and extended 

 to any length required. They are sometimes 

 formed on some naturally high, rising ground, 

 to save as much trouble as possible, in bringing 

 stuff from a distance ; and sometimes raised 

 ■whollv of forced materials. 



The situation for a Terrace may be varied as 

 the natural situation of the place may require. 



In respect ^o form, they should always be 

 broader at the base than the lop, and extend 

 lengthways to any distance required; having the 

 sides regularly sloped, of more or less acclivi- 

 tv, as the width, height, and situation admit. 

 Sometimes both sides are sloped, and sometimes 

 only one side, the other perpendicidar, and 

 faced with a substantial wall, &:c. or formed 

 against the side of a hill, or some naturally 

 rising ground ; being finished always broad 

 enough at top to admit of a proper walk. In 

 some naturally-elevated situations. Terraces are 

 sometimes formed one above another in two or 

 more ranges, each having its separate side slopes, 

 and elevated walk ; in all of which the slopes are 

 to be neatly laid with grass, and the walk at top 

 occasionally of grass or gravel. 



The entrances leading to Terrace-walks were 

 formerly sometimes formed by an easy acclivity 

 of a grass or gravelled slope, and sometimes by a 

 grand flight of stone steps. 



Where a rising ground, of considerable ele- 

 vation, naturally presents itself in a proper situ- 

 ation, it is an eligible opportunity for forming 

 a Terrace with the least expense and trouble, 

 on account of its not requiring the addition of 

 so much earth and rubbish as when raised en- 

 tirely on a perfect level, wholly of made earth. 

 Where there are any excavations of ground in- 

 tended to form ha-has, pieces of water, &c. 

 the excavated earth may be employed in forming 

 Ttrraces, &c. 



In the forming of a Terrace, the base must 

 be staked out wider than the intended width at 

 top for the walk, in order to admit of the ascent 

 of slopes being moderate. And the whole of 



the made earth and rubbish must he well rammed 

 and rolled down from lime to time as it is ap- 

 plied, in order to render the whole equally 

 firm, that it may not settle irregularly after 

 being finished. The slopes may eiiher he laid 

 with turf, or sown with grass-seeds ; but the 

 first is much the best method where it can be 

 emploved. See Grass-Ground. 



TETRAGONIA, a genus containing plants 

 of the shrubby and herbaceous succulent peren- 

 nial kinds. 



It belongs to the class and order Icosnvdna 

 Pcritani/riia, and ranks in the natural order of 

 Sucnilciitce. 



The characters are: that the calyx is a four- 

 leaved perianth, superior: leaflets four, ovate, 

 bent down and fiat, rolled back at the edge, 

 coloured, permanent : there is no corolla, unless 

 the calyx be called so : the stamina have twenty 

 filaments, capillary, shorter than the calvx : 

 anthers oblong, incumbent : the pistillum is a 

 roundish germ, five-cornered, inferior: stvles 

 four, awl-shaped, recurved, length of the 

 stamens : stigma longitudmal of the style, pu- 

 bescent: the pericarpimn is a coriaceous drupe, 

 four-cornered with four longitudinal wings; the 

 opposite angles narrower, not opening: the 

 seed one, bony, four-celled r kernels oblong. 



The species cultivated are: 1. T. Jhtticosa, 

 Shrubby Tetragonia ; <2.T. deaimhens. Trailing 

 Tetragonia; 3. T. herhacea. Herbaceous Tetra- 

 gonia; 4. T. echinata, Hedge-hog Tetragonia. 



The first has slender woody stems, rising 

 three or four feet high if supported, otherwise 

 trailing, covered with a light gray bark, and di- 

 viding into a great number of trailing branches, 

 which when young are succulent, of an herba- 

 ceous colour, and covered with small pellucid 

 drops, which reflect the light, somewhat like 

 the Diamond Ficoides : as the branches grow 

 older, they become more woody : the leaves are 

 narrow, thick, succulent, about half an inch 

 long, and a tenth of an inch broad, concave and 

 blunt-pointed; they are placed alternately, and 

 at their base comes out a cluster of smaller 

 leaves, which have the like pellucid drops with 

 the stalks : the flowers axillary, at every joint 

 towards the ends of the branches, solitary, or 

 two or three together. The fruit is an inferior 

 juiceless drupe. 



The second species has larger stalks than the 

 preceding, but they branch out in like manner : 

 the branches trail upon the ground ; the youno- 

 branches are very succulent, and almost as thick 

 as a man's little finger : the leaves are two inches 

 long, and an inch broad ; their surface covered 

 with very small pellucid drops, as are also tht? 

 young branches : flowers larger, upon pretty 

 3N 2 



