TRI 



TRO 



cut lor hay. Its stem tlicn has ac- 

 quired a hard, woody texture, and it 

 makes very inferior hay. Its princi- 

 pal vahie is to feed oil" with ewes and 

 Iambs before other feed is ready in 

 spring, or to cut it green for horses 

 and cattle. The ground may be 

 ploughed and prepared for spring 

 crops as early as is required ; and 

 thus the trifolium in no way inter- 

 feres with the usual rotations. When 

 the common broad clover has failed 

 from any cause, and bare patclies are 

 left in the fields in autumn, the trifo- 

 lium may be sowed there with advan- 

 tage ; it w^ill overtake the clover sow- 

 ed in the preceding spring, and fill up 

 the deficiency. In this case a mix- 

 ture of Trifolium incartialum and Ital- 

 ian rye grass {Lolium pcrcnnc Ilali- 

 cum) has been found very useful. 

 If the trifolium be sowed early in 

 spring, it will produce very good 

 feed in a few months, and the land 

 may afterward be sowed with tur- 

 nips, without any loss of time. It 

 must be recollected that tlie Trifoli- 

 um incarnatutn is a catch crop, that 

 is, one which comes in between two 

 regular crops, without interfering 

 with the rotation, and that it costs 

 little more than the seed, which is 

 easily raised, or may be bought at a 

 very moderate rate. All cattle are 

 fond of it in its young state, and it 

 comes in a fortnight earlier than lu- 

 cern, which is one of the first of the 

 artificial grasses fit for cutting in 

 spring. The great expectations rais- 

 ed at its first introduction not having 

 been fully realized, this plant has 

 rather fallen in the estimation of 

 farmers ; but if it is not so valuable 

 as the broad clover in a regular rota- 

 tion, it ought not to be despised as a 

 subsidiary crop. When the season 

 has prevented the sowing of spring 

 corn, it may be advantageous to sow 

 it, together with Italian ryegrass, as 

 soon as the land is clear of root- 

 weeds. They may e fed off with 

 sheep early in autumn, and the land, 

 being manured or not, as may be 

 thought necessary, may be ploughed 

 and sowed witli wheat. Thus the 

 trifolium and rye grass will come in 



the place of a clean fallow ; and the 

 ground having been covered during 

 the heat of the summer, and manu- 

 red by the sheep folded on it, will bo 

 much improved for the wheat crop. 

 It must be remembered that the tri- 

 folium requires a solid bottom, and 

 that the heavy roller should not be 

 spared before it is sowed. This is 

 chiefly to be recommended on soila 

 which do not suit spring tares, and 

 as a substitute for these ; for under 

 favourable circumstances the tares 

 will produce the greatest quantity of 

 feed. It is, however, useful to have 

 a choice of different green crops, 

 from which may be selected those 

 which offer the greatest prospect of 

 success, when the season, the soil, 

 and other circumstances are takeu 

 into consideration." 



TRIMERANS. A section of co- 

 leoptera, in many of which the tar 

 sus contains three joints. 



TRIMMER. In building, a piece 

 of timber framed at right angles to 

 the joists opposite chimneys or the 

 well holes of stairs, which receives 

 the ends of the joists intercepted by 

 the opening. 



TRIMMING JOIST. In build- 

 ing, a joist into which a trimmer i:? 

 framed. 



TRIPLE SALT. A salt with two 

 bases combined with one acid. 



TRISMUS. Locked jaw. 



TROCAR. An instrument for let- 

 ting out water in dropsies, wind in 

 hoven, &c. It consists of a sharp 

 rod of metal contained within a case 

 or tube of silver up to the sharp por- 

 tion. When used, the tube is separa- 

 ted in part from the rod and held 

 against the part, and then the rod is 

 driven in so as to penetrate into the 

 cavity, and, on being withdrawn, the 

 tube is pressed into the perforation, 

 and enables the fluid to escape per- 

 fectly. 



TRONA. The impure carbonate 

 of soda, or natron. 



TROPHI (from rptctxj, I nourish). 

 A name given to the different instru- 

 ments or organs contained in the 

 mouth or closing it, and employed m 

 manducatioii or deglutition. Tliey 



807 



