5o8 



TRANS. ST. LOUIS ACAD. SCIENCE. 



The annexed diagram, for the construction of which I am in- 

 debted to Dr. G. Hambach, represents the principal results of 

 these tables. The perpendicular lines divide the year into 73 

 periods of 5 days each, while the hoi'izontal ones mark the de- 

 grees. The central full-faced curve indicates the Mean Tempera- 

 ture of the penthemeral periods of the 47 years, as actually found, 

 while the dotted line represents the supposed real Mean Temper- 

 ature as suggested in the last column of these tables. The upper- 

 most curve shows the Highest Temperatures and the lowest curve 

 the Lowest Temperatures observed in those same penthemeral 

 periods within the same number of years. It will be noticed that 

 while the points of Mean Temperature occupy the centre of each 

 period, the Maxima and Minima do not show in the middle of the 

 spaces, but on that one of the 5 days of the period on which they 

 actually did occur. 



