Assortative Mathtg in Man 



4.S!) 



(if thi' singlc man, Ihat lakiii'^ thc wliolc )Mi|iiilat iciii il nidrc tliaii (•(iiii|icii.salfs f'oi- 

 tho tacl that- tlie inanaod man lives lotiger than tlii' luari'ied woiiiaii. 



(c) In all cases in the abovc; table, and in fact in all thi; material wc havc yul 

 fxaniincd Cur adults, duration ot' lif'u is a niore variable character in the womau 

 than in the man. 



((/) Tho raisinsf of the mean Icngths of lit'e and the l()\verin<( ef th(^ variabilities 

 wheii \ve takc Ci(i'2 ont of thc 87G Yerkshire cases, althongh slight is signitieant, and 

 of some little interest, for it Oön-esponils pfaetically to a Separation of the Wensley- 

 dale and Wharfedale data. It would seeni to indicate that in the two adjacent 

 dales there niay really exist a slight dift'ercutiation in this rharactcr dne cither to 

 a difference of race or to a difforenee of eiivironment*. 



(9) We have compared the Yorkshire and Oxfordshire series, namely in tlio 

 relationship of the Icngths of lifo of hnsband and wife (H and W) with the 

 husband's .seniority (A) at marriage and bis .su)-vival period (A'). 



This table shows at once a remarkably close agreement between the Oxfordshire 

 and Wensleydale series for the correlations first between wifc's Icngth of life and 

 husband's years of survival {vwaO and secondly between husband's seniority and 

 his years of survival (r^^). Within the limits of the nurabers dcalt with these 

 correlations are identical for the two series, and are probably significant for the 

 whole cüuntry. The most noteworthy feature is the comparatively small corre- 

 lationship between the husband's seniority and the wife 's survival period (-A'). 

 Loüked at froni the Standpoint of regression we may say that in Wensleydale for 

 every year that the husband exceeds thc mean seniority of 8'ö80, the wife exceeds 

 her mean survival period of 2-230 by -38.5 years; wliile in Oxfordshire for every 

 year that the husband exceeds the mean seniority of 2-812, the wife exceeds her 

 mean survival period of 1-986 by '403 years. This regression, scnsibly the same 

 for the two districts, is perhaps less than we might have anticipated ; an increase 



* Wensleydale runs roughly east and wost, AVliarfedale north and soiith for the part dealt with. I£ 

 the sanitary and uurture eonditions have ehanged niuch in tlie last two hundred years, whiuli anyone 

 well acijuainted with tlie history of the Yorkshire dak-s will hardly aduiit, a third source of diffcrcntiation 

 is possible. The stone of Wharfedale may be more lasting tlian that of Wensleydale, and thus in 

 the former uaso a larger proportion of grave data from thc 18th ccutnry may be inchuled in the series. 



