566 
have, and how much has this number 
diminished in the forty years under 
consideration? What per cent of mar- 
riages are childless ? 
CRITICISM OF DATA 
“T now wish to criticize the data about 
to be presented. The column ‘Average 
Number of Graduates’ is based on the 
total number of graduates for each 
class, whether or not adequate future 
family history was available. The next 
columns,‘Average Number Married,’ and 
‘Per Cent Married,’ are based on the 
total number known to be married for 
each class. It is a little under the 
The Journal of Heredity 
correct figure, because some of the lost 
men may have been married: but the 
error is very small except for the first 
decade for Harvard, classes 1853-60. 
In this decade 20.7% of the names were 
thrown out, injuring to a considerable 
extent the records for this period. In 
the next decade only 1.2% of the total 
names were found wanting; in the next 
3.2% and in the last only 1.9%. Thus 
the total average error is very small. 
The Yale reports are even more re- 
liable, but the percentage of ‘lost’ 
men has not been figured for Yale 
college. 
“The next column represents the 
TABLE I.—Harvard. 
a © a = = Hie fa Or 5 eR VO us) a3 ¢ |a |r 
poe = mas — r= ' = baal bw) (5) = 
ae 5 a 3 G ne || y rs) ee on | = 
S a Loe?) | e 
oa| £ | @ |.fai5 [se8| eels lag | 8 |. = eee 
Decade | 6U| 6 | Gg | els [683] 63 | cu lot i 3 ay: 
2y| 24 | 8 | sklz |zeslagiagiq |S | Sooo 
o%| 2 Igo] o aSo of | oF |oB |G | 281 $e 
Bi, | 0 5 |PEo| Sh lawdl o Ge ligt eercand Aoeh = 35 
£2 |) 8 So lees 85 (855) 88 | 2S (age) 2 ew a 
os | 2 5 248) $4 Son) Sa) $a Sas pa | os ye 
< < a 1S cs ac <j. [eo |e 
1851-60 | | 
Average of | ) 
6 years 90:8) 49-2)..,68:| $29. 158,835 | 1.68 | 122.5) 2.52 | 1.36 |° 4. Sloe 
1861-70. | 101.9) 77.3) .76) 8.5 | 203.2) 2.62 | 1.98 lists |h PAILS |b}, | 14.2 | 18.6 
1871-80. ).457.5| 11534) *275 |" ‘9.0. | 256.4) 2223 | 1,63 | 229.8) 2.0 | 41.46 | 2529" aoes 
1881-90 | 248. | 183. WOH leo. Oat Olesol ae OO | 1.55 | 345.8} 1.91 | 1.44 | 43.6 | 23.4 
Grand aver-| 
age. 149.5 106.2 .74 8.7 | 245¢9| 2.51 | 1.71 | 217.8) 2:17 | 1.49 |. 
TABLE II.—Yale. 
it ye fs =i 3 q 3 ce fc 2D 
= ., do |e |#8 |2 | 8 |jea-lo | ie 
= @ a —F 3 = ae = “O° ieee 
a = = Seg be = Eb e = Cae 30 Pale 
sw & ) 3 = 5) ©, 1 ‘o¥ eS 
oy) 2 | EF lkas stg fe|s |By [|e | SBlC 
Decade 5% } Sr octad fig 683i 63 | Su lok i SE | on 
An] Z E cel 2 |2aa/ 29/28 |4ad | & Ag) 2 
ee) 2 | # Pee eB. (Boh gh) Se lee |e | oe) SE 
So i} 5 rw Se ro) Sy SE 1Sug!l Ca wee a 
a i ove wo = oO wey | BO ~ a) 
Ya v .§ SBR] $5 |Pac] Sa! Pa |Pael ase | CSS] Be 
ae > Oo =e Ae > > id a (3) > i; @ 
=< < a a ees be es eae ee < av 
1850-59 | 
Average of E 
9 years 98. (Sy. .78 7.5 | 247.1) 3.32 | 2.53 | 196.1) 2,64 | 2.0 10.5: } das 
1861-70 107.6) 86.4 .81 7.8 | 233.6] 2.69 | 2.16 | 197.8) 2.28 | 1.83 | 16.4) 19.1 
1871-80 120.5; 94.5 79 8.5 | 211.9] 2,23 | 1.75 | 181.9] 1.92 | 12952") 20,350 
1881-90 135.9) 101.7 75 8.2 | 207.6, 2.04 | 1.53 | 189.8) 1.87 | 1.40) ZL. Soa 
Grand aver- 
age. 115.5) 89.4 78 8. 92524) 2.5754 1299) 19134 2588s LO9 i coe | Sia eee 
