570 EVERYDAY SCIENCE 



the brightest star in the heavens, which appears low on the southern 

 horizon in midwinter. 



Among the many interesting books on the study of the stars are 

 the following : 



"Earth and Sky Every Child Should Know," Rogers. Double- 

 day, Page & Co. 



"Easy Star Lessons," Proctor. G. P. Putnam's Sons, New York. 



"The Book of Stars," Collins. D. Appleton & Co., New York. 



For those whose interest in the study of the heavens does not 

 wane, a most useful and interesting device is "The Barritt-Serviss 

 Star and Planet Finder." This is a cleverly constructed, revolving 

 chart which furnishes in a moment's time a map of the heavens for 

 any hour of any night of the year. Address Leon Barritt, Publisher. 

 (See footnote, p. 569.) 



PROJECT V. How to Clean Drain Pipes, pages 56 and 57 



Nothing has a more important bearing on the health of a house- 

 hold than the condition of drain pipes leading from sinks, washbowl, 

 and bathtubs. Typhoid, diphtheria, and other deadly germs find 

 ideal breeding places in the grease and filth of these drains. House- 

 keepers who keep their homes otherwise immaculate sometimes for- 

 get the cleansing of drains because the unsanitary accumulations 

 are out of sight. No sink drain ought ever to go without attention 

 until the waste water runs slowly or the pipes are clogged. 



If a sink becomes clogged, a cupful of lye in a wash-boilerful of 

 boiling water will generally cut the grease that has gathered and 

 holds other waste accumulations. Chloride of lime used in the 

 same proportions will accomplish the same purpose. The solution 

 should be poured in fast enough so that it will run through with 

 considerable force. If this fails, cover the opening to the drain and 

 fill the sink with a second boilerful of the solution. Then with a 

 force-cup (familiarly known as a "plumber's friend") force the 

 mixture down the drain pipe. This seldom fails to produce the 

 desired result. 



