What the Size of an Egg Means 
such a performance. Forty-five of the 
large eggs were laid without any previ- 
ous resting period, thirty-one were laid 
with a resting period of one day before, 
and ten were laid with a resting period 
of two days. 
131 
It seems obvious, therefore, that 
neither small nor large eggs are neces- 
sarily laid either at the beginning or end 
of a hen’s laying period, but that they 
are most often laid during the time of 
heavy egg production. 
- 
TABLE I.—Weight in Grams of Smail Eggs and Weight of Eggs Immediately Preceding and 
Following. 
No. days. 1 2 3 a 5 6 7 8 9 10 11 12 
1911-1912 
Hen No. 263 54.4 45.4 49.9 13.6 49.9 54.4 49.9 49.9 
1912-1913 
Hen No. 126 68.0 68.0 63.5 18.1 68.0 63.5 3-01 OSs 
1913-1914 
Hen No. 629 49.9 49.9 49.9 13.6 49.9 54.4 54.4 54.4 
1914-1915 
Hen No. 806 48.2 48.6 47.5 47.5 27.4 48.0 48.4 48.6 48.2 
TABLE I].—Weight in Grams of Large Eggs and Weight of Eggs Immediately Preceding and 
Following. 
No. days. 1 2 3 4 5 6 7 8 9 10 11 12 
1911-1912 
Hen No. 219 58.8 58.9 58.9 86.2 544 54.4 544 544 49.9 
1912-1913 
Hen No. 144 58.9 58.0 90.7 63.5 58.9 58.9 58.9 58.9 
1914-1915 
Hen No. 862 58.9 58.9 58.9 90.7 544 58.9 63.5 58.9 63.5 
1914-1915 
Hen No. 321 70.1 50.4 91.9 564 56.9 56.9 HOAb Sal 
Civilization and Climate 
CIVILIZATION AND CLIMATE, by Ellsworth jn the past the same type seems to 
Huntington. Pp. xii + 333, price $2.50 net. pave prevailed wherever a great civili- 
Yale University Press, New Haven, Conn. 
By experimental tests and an appeal 
to history, Professor Huntington sup- 
ports the thesis that a particular kind 
of climate is necessary to the develop- 
ment of a high civilization and that 
man is, therefore, more dependent on 
his environment than he is wont to 
suppose. The conditions which seem 
essential to the writer are a fairly high 
average temperature with moderately 
large daily fluctuations. This peculiar 
type of climate prevails today wherever 
civilization is high, the author thinks; 
zation arose. Therefcre such a climate 
seems to be a necessary condition of 
great and permanent progress, although 
by no means the only, or the most im- 
portant condition—much less a cause. 
In supporting this thesis, the author is 
led to an extended discussion of the 
importance of race, in which he shows 
admirable poise. The book is unusual, 
as the presentation of a novel and val- 
uable hypothesis, in a most interesting 
manner, and with an amount of well- 
balanced judgment which writers of 
books like this seldom show. 
