528 Prof R. Threlfall and Mr. J. F. Adair. Chi the 



Temp, of water. 



160 ' V B + l-56 = 142538 



15-8 V B + l-36 = 192178 



15-8 Vb + 1'36 = 174657 



The equations for the probable values of V B and b are — 



f.24V B + 116 = 4269946, 



and \l-]V B + 27-976 = 476912. 



Hence V B = 177453, b = 10072. 



The smallness of b compared with a, the corresponding quantity in 

 Class A, may perhaps be referred to the greater Dumber of observa- 

 tions in Class B ; yet it would not seem to represent the real increase 

 of velocity due to an increase of 1° of temperature. 



In order to get the probable error of the mean, viz., 177453, using 

 the above value of b, the above equations become — 







Departure from mean. 





= looyyu 



— ZU4fcOo 





10 / 1 /O 



— / 





164364 



-13089 





165501 



-11952 





199295 



+ 21842 





166145 



-11308 





167051 



-10402 





164506 



-12947 





167202 



-10251 





185336 



+ 7883 





202485 



+ 25032 





199741 



+ 22288 





204638 



+ 27185 





185917 



+ 8464 





202656 



+ 25203 





188289 



+ 10836 





194026 



+ 16573 





173680 



-3773 





191975 



+ 14522 





172367 



-5086 





171448 



-6005 





127437 



-50023 





179084 



+ 1631 





161563 



-15890 



Mean as before . 



. . . 177453 





Probable error of mean (Peters's) == 2665. 



