588 Journal of Agriculture. [10 Sept., 1910 



pipe projecting from the vice or it may twist and split. After revolving 

 them two or three times, remove the dies, and oil the thread ; then replace, 

 and continue screwing until the end of the pipe projects through the face 

 of the die. Up to ij inch screwing is easy work for one, but for larger 

 sizes assistance will be required. 



A connexion to a tank is illustrated on page 586 (Xo. 11). All the 

 finings required are named. These will need to be bedded with white 

 lead or paint. Keep the end of the pipe up from the bottom of the tank 

 to prevent sediment getting into it. If necessary to run the pipe to a 

 draw-off tap for domestic, dairy, or other purpo.ses, or to a water trough, 

 proceed as follows : — 



First open your trench, if any, aljout a foot deep or deeper where 

 under cart tracks. Then get the length from tank to ground and cut and 

 screw the pipe to suit. Place a bend at the bottom, or a tee plugged one 

 end would be better to allow for future extensions. Work from this to 

 the trough, screwing up all joints firmly on the way — a little hemp on 

 the threads will assist in making them water-tight. Should a ^ branch be 

 required, use a tee. It would be as well to consider whether one is likely 

 to be required for future use; if so. fix it now, and plug up. for it is 

 very troublesome to insert one afterwards. 



When .screwing up small pipe, say f inch or \ inch, a little caution 

 i.> necessary to prevent splitting the fitting ; so for small work do not use 

 the powerful wrenches or long levers suitable for heavy strong pipe. When 

 entering the thread let it find its own way just as in screwing a nut on a 

 bolt. Keep the pipe straight and do not use force or you may cross the 

 thread and strip it. When once it has entered it may be screwed up with 

 the pipe wrench. 



It would be wise to fix a stDp tap (13/^) just below the tank. A ball 

 tap similar to that illustrated {\ T)C) can be used for the troughs. The other 

 taps shown in Xo. 13 are suitable for farm, dairy, domestic, and other 

 uses. 



HOUSEHOLD INSECT PESTS. 



{Coniiuucd from fagc 482.) 

 C. /''renc//. juh-ii>r. Assistaut Entomologist. 



Cockroaches. 



Cockroache.": are. usually found in cre\-ices near fire places. They are 

 omnivorous, their food consisting of any dead animal matter, cereal pro- 

 ducts, and other kinds of food. It is also stated that they will eat 

 woollens and leather, frequently causing extensive damage to books. 



The eggs, instead of being deposited separately as with other in.sects. 

 are brought together in the abdomen of the female irito a hard horny po;] 

 or capsule, which often nearly fills the body of the parent. The number 

 of eggs in the capsule varies in the different species. They are arranged 

 in two rows, the position of the eggs being indicated on the exterior ot 

 the capsule by transverse lateral impressions. The capsule is oval, elon- 

 gate, or somewhat bean-shaped ; and the young when hatched pass through 

 a number of moults. It is stated by some entomologists that It takes four 

 or five years for a cockroach to reach full growth, but this is not yet con- 

 firmed. The general opinion is that one generation per year is produced. 



Remedies. — Powdered borax sprinkled into crevices is an old 

 fa.shioned but reliable remedy. Mr. Tepper, Entomologist of the Adelaide 



