254 EEPOET OF THE COMMISSIONER OP AGRICULTURE. 



Louisiana.— Three broods; years 1894 [XVIII*], 1897 [VI*1, 1898 

 rVII*], and possiblv a fourth in 1888 [X*]. 



Maryland.— Four broods; years 1889 [VIII], 1893 [XI], 1894 [XIIJ, 

 and 1902 [XXII]. 



Massachusetts.— Three broods; years 1886 [I], 1889 [VIII], and 1900 



MicJiifjaii.—Threehroods ; years 1888 [V],1894 [XII], and 1902 [XXII]. 



Mississippi.— Yoar broods; years 1894 [XVIII*], 1896 [IV*], 1897 

 [VI* I, and 1898 [VII*]. 



Missouri.— Four broods; years 1894 [XVIII*], 1895 [XIII], 1890 [XIV], 

 and 1893 [VII*]. 



Montana and Wyoming. — One brood ; year 1898 [XVII]. 



Nebraska.— Three broods: years 1891 [IX], 1895 [XIII], and 1890 

 [XIV]. 



Netc Jersey.— Four broods; years 1889 [VIII], 1894 [XII], 1898 

 [XVII], and 1902 [XXII]. 



Neio Yor/w— Six broods; years 1889 [VIII], 1894 [XII], 1898 [XVII], 

 1890 [XIX], 1900 [XX], and 1902 [XXII]. 



North Carolina.— Ei^ht broods ; years 1889 [VIII], 1893 [two broods 

 XI and XVI*], 1894 [two broods XII and XVIII*], 1898 [XVII?], 1901 

 [XXI], and 1902 [XXII]. 



Ohio.— Seven broods ; years 1889 [VIII], 1895 [XIII], 1890 [XIV], 



XXII]. 



, 1889 [VIII], 1894 [XII], 



1897 [XV], 1898 [XVII], 1900 [XX], and 1902 



Pennsylvania. — Ei.obt broods: rears 18S8 [V 

 1897 [XV], 1898 [XSai], 1899 [XIX], 1900 [XX], and 1902 '[XXIlj 



South Carolina.— Two broods : years 1894 [XVIII*] and 1902 [XXII 



Tennessee.— Six broods ; Years 1889 [VIII], 1893 [XVI*]. 1894 [XVIII 

 1896 [IV*], 1898 [VII*], and 1902 [XXII]. 



Texas.— Three broods; years 1888 [X*], 1894 [XVIII*], and 1896 

 [XIV]. 



Virginia.— Fixe hroods; years 1893 [XI], 1894 [two broods XII and 

 XVIII*], 1901 [XXI], and 1902 [XXII]. 



West Virginia.— Fixe broods; years 1889 [VIII], 1897 [XV], 1898 

 [XVII , 1901 [XXI]. and 1902 [XXII]. 



Wisconsin.— Three broods; years 1888 [V], 1898 [XVII], and 1902 

 [XXII]. 



THE INFLUENCE OF CLIMATE UPON THE RACES. 



It bas already been sbowu that the 17-year race is essentially Xorth- 

 eru and the 13-year race essentially Southern. But Irom the fact that 

 at certain intermediate latitudes they either oyerlap or very closely ap- 

 proximate each other, and the further fact that no races requiring any 

 intermediate periods for development are so far known, we may con- 

 clude that the separation took place in the remote past and that each 

 race is to-day but little affected by the character of the climate. Indeed, 

 it )aay be questioned whether a hypogean insect which dwells for the 

 ir.ostpart so deep in the ground as to be measurably beyond the reach 

 of the atmospheric changes of temperature will be very materially in- 

 Huenced thereby. Yet there are several interesting scientific questions 

 upon which light would be thrown by any obtained data as to the 

 actual influence. 



We have, for these reasons, had in mind for some time to make a 

 series of experiments by transferring the eggs of one of the septendecim 

 broods to the extreme Southern States in which the tredecim only is 

 known to occur, and vice versa. 



