438 



Dr. J. W. Nicholson on the Damping of the 



It may be noted that of course similar considerations apply 

 to the females in the population. The appended table shows 

 the age-distribution calculated according to formula (10) for 

 England and Wales 1871-1880. The requisite data (including 

 the life table) were taken from the Supplement to the 45th 

 Annual Report of the Registrar General of Births, &c. The 

 mean value of r' (mixed sexes) for that period was "01401, 

 while the ratio of male births to female births was T0382. 



It will be seen that at this period the observed age-distri- 

 bution in England conformed quite closely to the calculated 

 " stable " form. 



Table. 



Age 



(Years). 



Males. 



Females. 



Persons. 



Calo. 



Obs. 



Calc. 



Obs. 

 132 



Calc. 



Obs. 



0- 5... 



139 



139 



136 



138 



136 



5-10... 



118 



123 



115 



117 



116 



120 



10-15... 



107 



110 



104 



104 



106 



107 



15-20... 



97 



99 



95 



95 



96 



97 



20-25... 

 25-35. . 



88 

 150 



87 



87 

 148 



91 



87 



89 



144 



149 



149 



147 



35-45... 



116 



112 



116 



115 



116 



113 



45-55... 



86 



84 



88 



87 



87 



86 



55-65... 



57 



59 



62 



61 



59 



59 



65-75... 



30 



31 



35 



35 



33 



33 



75-oo 



11 



12 



15 



15 



13 



13 



LI. On the Damping of the Vibrations of a Dielectric Sphere > 

 and the Radiation from a Vibrating .Electron. By J. W. 

 Nicholson, M.A., D.Sc* 



THIS note is supplementary to two short papers in the 

 Philosophical Magazine for October and November last, 

 dealing with the initial motions of conducting and dielectric 

 charged spheres. The object of these papers was chiefly to 

 indicate that if an electron could be regarded as not subject 

 to contraction when in motion, the most useful property to 



Comnumicated Lv the Author 



