LuCAI.fTY, 



"*'"■ Ray. 



JiOCAl.ITV, 



lliiiatilln . . . 

 Wallula . . . 



Lewiston 

 Pendletim. 

 Yakima . . . 

 Colville . . . . 

 Potlateh . . 

 Revclstoke . 

 Little S|M)k;iii» 

 Spdkane . . . 



Ifanfriiiiin Creek.. 



I'ond (I'Oreillp ...... 



.'^tiiall Creek 



Payette ' . '. 



{^nake liiver. 



Caldwell. ...... ;■'. 



(i olden 



La (irandc 



Flat Head. 



Brown's (i iili-li ...... 



Eleva- 

 . tion. . 



Av.X<i. 



oCAnaJ 



Ray. 



1,9111 

 •.',000 

 2,1' 

 L'hoO 

 2,150 

 2,872 

 2,550 

 2,550- 

 :5,100 

 5.344 



< Inly one spec-iinen. 



."^mniiKirizin^ this: Px-low l.OdO I'ci'l llu- avoriini's iirc I'.l iiiid '20; aliovi' 1,000) 

 feet only oiu- averages 20, (Hily mie leaelies lit. two r<'ai'ii IS, lour have 17. seven 

 have 1(> and two have lo. Tliese ligiires ''are not sn imaniiiioiis in their indica- 

 tions"'' of a decrease of rays with an increase nl altitude as those for the I"'i-a/.er 

 system, .lint the lower locality generally possesses a higiier nnniher of rays. 

 Here, when- we have data fnjni many widely separatetl hranche.s, a close varia- 

 _ tion of rays with altitude is not found. Local issues have modified national ten- 

 deiuies among these lisiies in the Colnmhia system. 



Among the locality curves (figures 4 and following) the iileal curve is iiio^i 

 nearly apiiroached at (aldwell. The variation from the average is here ei|ually 

 great in Loth directions, and the curve of the ascending variation is almost ideu 

 tical with the curve of the descending variation. Nearly as ideal conditions are 

 f<iunil at I.ilile .'"Spokane, where the extent of variation is much smaller. A priori 

 such symmetry or approacii to >yminetiy is to he expected for each locality, lint 

 the deviations from it arc many aiid great. The many shouldei's and peaks in 

 localities fi-oin whicli hut few specimens havi' ln'cn collected, indicate proh;ihly 

 nothing so much as the lack of a sufficient niimhei' of s|)ecimens. When hut ten 

 sjtecimens are examined, each specimen, more or less, makes such a vast difl'erence 

 in the character of the curve that the localities with less than Iwi-nty specimen- 

 may he dismissed without further notice. 



• .\side from curves, such as that of Little Spokane, whi-re a certain niindier of 

 rays is the pre<lominant one, we have curves, such as that of the Payette Kiv<r. 

 where the numlier of specimens having Ki, 17, 18, 11) and "20 rays, is nearly c(|nal. 

 Still .-mother type of curve is represented hy the curve?; for Tyake Washington, 

 t'olville and Umatilla, in which two numheis predominate, with the iniervening 

 numbers in minority. The contlitions are most marked at Umatilla, where we 

 have two incipient varieties with IS and 21 as the predonunatin numher of rays. 



