866 Journal of the Department op Agriculture. 



indicated by arrows (see elevation). The system is supplied from a 

 supply tank on the roof, from the bottom of which tank a pipe leads 

 to the bottom of the hot-water cylinder. The supply tank is 

 replenished from the main, through a ball-cock. From the top of the 

 hot-water cylinder an expansion pipe, for the escape of steam, takes 

 off, and may be either bent over the supply tank so as to discharge 

 into it or carried through the roof. As an additional precaution, in 

 case of the expansion pipe becoming choked through deposit from 

 highly mineralized water or otherwise, a small safety valve, set to 

 open at a comparatively low pressure, should be attached to the boiler. 

 The service pipe to the hot-water tap or taps branches off from the 

 lower end of the expansion pipe. 



A list of some of the quantities of materials more difficult io 

 estimate is appended. It is only approximate, however, because the 

 quantities used depend greatly on the particular workman, and on 

 other circumstances, such as the size of stones used in building 

 etc. : — 



Bricks for party walls, 3000 bricks. Mortar for walls. 42 bags 

 blue lime ; IS^ cubic yards sand. Materials for floor, 15| bags 

 Portland cement; If cubic yard sand; 2f cubic yards broken 

 stone, to pass a 25-inch ring ; f cubic yard broken granite 

 to pass a f-inch ring ; ^ cubic yard granite chips to pass a 

 ^-inch ring. Materials for lintels and sills (of 1:2:3 

 concrete), 7f bags portland cement; 1.1 cubic yard sand; 

 1.6 cubic yard broken stone, to pass a 1-inch ring. 

 Cement plaster for lower 4 feet of walls, bh bags portland 

 cement; Ij cubic yard sand. Lime plaster for upper 

 6 feet of walls, 6i bags blue lime; 2A cubic yards sand. 



The quantities of timber, corrugated galvanized iron, piping, etc., 

 can readily be measured from the drawing, which is sufficientlj^ 

 detailed for the purpose. It is better for the person who is resjionsiMe 

 for the work to do- so than to rely on a list of materials, because in 

 the former case he gets a better understanding of what each piece nf 

 material is for. 



Seville Oranges. 



Citrus growers will be interested to hear that a farmer in the 

 Pietersburg District who states that his Seville trees are not affected 

 by frost, enabling him to grow them in areas not generally accepted 

 as being adapted for citrus culture, sent a sample box of Seville 

 oranges, used for the manufacture of marmalade, to a well-known firm 

 of jam manufacturers in England, who report that " they prove to be 

 the true bitter orange, and have made an excellent product, being 

 very similar to the marmalade made from Seville oranges at the 

 commencement of the season. They are perhaps slightly more bitter, 

 and not quite so aromatic, but the jellying property seems to be fully 

 up to standard. Such good results from bitter oranges have not been 

 met from any other part of the world, and . . . they must have been 

 grown from the Seville seed." 



