Insect Extekminators. 113 



purpose, such as the hurning of sulphur in early fall, it 

 will he neeessary to equip eaeh discliargc witli valves, 

 and, although thi"^ adds to the expense, it will, I think, 

 he found to he the hest way. One of the objects I had 

 in view when thinking of adopting this system, was the 

 suppression of mildew in the early fall liy use of the 

 same set of pipes. 



In lajdng these pipes, raise the main distributing one 

 to the height wanted; then, from that point to the ex- 

 treme end of the diseharge pipe, let the fall be gradual, 

 in order that no eondensation may ever remain in them. 



All the mains through which the vapor passes, should 

 be well protected with asbestos, or some other covering, 

 as it is very important in the line of economy, that no 

 eondensation occurs while the vapor is being used. 



It is best to so arrange the pipes as to he able to va- 

 porize the houses in blocks of four or eight. For the 

 former number, the main from the cylinder, as well as 

 the feed from the boiler, should be of one and a quarter 

 inch pipe, all the other connections about the cylinder 

 may he of incli if preferred. If it is desired to vaporize 

 eight at once, one and three-fourths inch mains should 

 be used. 



Of strong manufactured extract, one half pint is al- 

 lowed to a liouse of 100 feet. If four houses ar(^ to be 

 vaporized, place one quart of extract in cylinder A by 

 means of a funnel at J, after which replace the plug or 

 whatever is used for closing the aperture. If it is de- 



