i.] ANTECEDENTS. 41 



ference to the publications of which the titles are 

 given ; and the whole could have been obtained 

 by any one w r ho cared to search other more or 

 less public sources of information. Five of these 

 families (Bentham, Darwin, Dawson-Turner, Ros- 

 coe, and Taylor of Ongar) have already been 

 alluded to in my previous work (" Hereditary 

 Genius "), whence I have extracted what appeared 

 to the point, adding what was necessary. In 

 estimating the number of individuals in each 

 generation, the practice has been usually adopted 

 of not counting those who died young, or have 

 not yet attained their 30th year. 



ALDERSON. Many members of this family 

 have been intellectually gifted. There has been 

 an unusual number of cases of mathematical 

 achievement among them. 



First generation. 5 males and 2 females, chil- 

 dren of the Rev. J. Alderson and his wife (the 

 latter lived to 94). Of these, 3 males deserve 

 notice : (1) James Alderson, M.D., of Norwich ; 

 (2) Robert Alderson, Recorder of Norwich, Ips- 

 wk'h, and Yarmouth ; (3) John Alderson, founder' 



