544 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



pressures have been pushed together, so as to come within the limits of 

 the drawing. The actual separation of the curves is about ten times 

 that shown. The pressure and the value of the volume at 0° are 

 indicated on each curve. The manner of transition from abnormal to 

 normal is shown distinctly, and requires no comment. At 1500 kgm. 



,0000 

 ,9776 



w 



-20° "15 



-10" -5" 0" 5 

 TEMPERATURE, 



Figure 40. Curves showing the relation between volume and tempera- 

 ture of water for various constant pressures. The numbers in the body of 

 the diagram show the constant pressure of each curve; the numbers to the 

 right show the volume at 0° of the liquid at the indicated pressure. If drawn 

 to scale the curves should be separated about ten times as much as shown. 



we actually have realized a curve with both a minimum and maximum, 

 like the conjectural curve at atmospheric pressure. The curves show 

 one thing in connection with the previous experiments, namely, that the 

 depression of the maximum density point with pressure cannot continue 

 linear with pressure much beyond 300 kgm., the limit of the previous 

 experiments, but the temperature of the maximum becomes nearly 



