Probability Variations in Distribution of a. Particles. 199 



As the latter is far more easy to draw than the former a 

 curve of Type V. has been fitted to the data, the following 

 being the extra constants involved : — 



p= 70-2582. logy = 116-1842. 



y= + 1063*8192. Origin = mean -15-5852. 



Mode= mean — -4437, 



the skewness being '2335. The curve is shown in the 

 diagram, the stepped figure giving the corresponding experi- 

 mental frequencies. The areas of portions of the curve 

 bounded by ordinates determined by the data are shown 



1 J 3 TS 5 7 8 9" 10 II IZ 



Number of ©c parti cles in interval 



below, the corresponding theoretical values and experimental 

 numbers being also given. The last five observations are 

 clubbed together as they could not accurately be measured 

 separately by the planimeter. 



Experimental values . 57 203 383 525 532 408 273 139 45 27 16 

 Theoretical values ... 54 210 407 525 508 394 254 140 68 29 21 

 Values from Curve... 57 216 399 553 533 391 251 123 49 24 12 



