310 



Prof. B. Stewart and W. Dodgson. [Nov. 20, 



least like. But all these curves have a very considerable likeness 

 both to the mean curve and to one another. In the following table 

 we have compared the six common prominences A, B, C, D, E, F, 

 giving the numerical and time value of each for each observatory, as 

 well as for the mean curve. 



Table VII. — Giving the Numerical and Time Values of the various 

 Prominences of the Temperature Curves. 





Mean. 



Kew. 



Utrecht. 



Toronto. 



Designation 



Nume- 



Time 



Nume- 



Time 



Nume- 



Time 



Nume- 



Time 



of 



rical 



value 



rical 



value 



rical 



value 



rical 



value 



prominence. 



value. 



in days. 



value. 



in days. 



value. 



in days. 



value. 



in days. 



A 



3650 



23-633 



4740 



23614 



4100 



23 624 



4450 



23 640 



B 



2640 



23730 



4010 



23 752 



2580 



23-710 



5250 



23705 



C 



3810 



23-900 



5980 



23-914 



4630 



23-895 



3560 



23-853 



D 



3000 



24-029 



5140 



24-035 



3960 



24033 



3530 



24-015 



E 



2430 



24210 



4040 



24-185 



5810 



24-154 



4280 



24-195 



F 



3790 



24332 



4400 



24334 



5800 



24-298 



3660 



24-322 



10. We have hitherto been comparing together the periods of the 

 chief temperature inequalities as indicated by the various observa- 

 tories. Let us now compare together these inequalities themselves. 

 For this purpose prominence A may be conveniently represented by 

 taking a mean of the two inequalities for — 6"0 and —5*5. 



Prominence B in like manner by a mean of — 4*5 and — 4*0 



C „ „ -2-0 and -1-5 



D „ „ 0-0 and +0'5 



E „ „ 4-3-0 and +3'5 



F „ „ +5*0 and +5'5 



Let us perform these operations separately for each of the three 

 stations, and also for the mean of the three as above determined, after 

 having brought them all to the same phase by the method above 

 indicated, and we thus obtain the following table : — 



