118 INTRODUCTION TO GENERAL SCIENCE 



b. 1802:126-128. The Siphon. 



c. 1804:170-172. The Siphon. 



d. 1805:148-149. The Siphon. 



e. 1806 : 45. The Siphon. 

 /. 1807:45-46. The Siphon. 



g. 1808 : 152-153. The Siphon and its Action. 

 h. 1809:47-49. The Siphon. 

 i. 1810 : 74-75. The Siphon. 



Experiment 45. The Siphon. 



Apparatus: Bottle, wide mouth, 500 c.c., rubber stopper 

 with two holes to fit, short glass tube bent at right angles, 

 long glass tube bent at one end so that the shorter leg reaches 

 the bottom of the bottle while the other leg is about three 

 feet in length. The lower end should be bent into a loop and 

 the tube drawn out to form a small tube. Battery jar 6"X8". 



a. Fill the bottle three-fourths full of water, insert the 

 short right-angle tube in the stopper so that one end just 

 passes through it; insert the short leg of the long tube in the 

 other hole and push the stopper into bottle. Place the 

 battery jar so as to catch the water, and " suck " on the outlet. 

 What happens? 



b. Place the finger on the open end of the right-angle tube. 

 What happens? Why? 



c. When the water has passed out of the bottle, fill it again 

 and devise some method of starting the siphon besides 

 " sucking." 



87. NITROGEN AND ITS USES 



Nitrogen forms no chemical compounds readily, and is said 

 to be an inert gas. Its chief effect in the atmosphere is to 

 dilute the oxygen. It is probable that animals could not live 

 in an atmosphere of pure oxygen. Nitrogen has also another 



