Table 11.— Total number of glU rakers from samplee of striped base of the I953 

 year class from the tributaries of tbe Chesapeake Bay 



A 



River 



Total Do. GlU Rakers 



21 22 23 2if 25 26 



No. 



Mean 



S(X - x) 



^\2 



York - yr. 

 tfettaponi - yg. 

 t = 2.83«* 



17 25 19 5 79 23.772 123.899 



691 16 24.688 5A38 



B 



River 



Total No. Gill Rakers 



21 22 23 2k 25 26 



No. 



Mean S(X - x)2 



York - yr. 

 Rappahannock- yr. 

 t = 1.75 N.S. 



9 17 25 19 5 

 1 9 11 10 k 



79 23.772 123.899 

 35 2U.200 37.600 



Table 12.— An amalysis of covariance of the total nuniber of gill rakers for 

 seuiiples of the 1953 year class from the York River System 



Source 



d.f. 



3x2 



Sxy 



3y2 



Y adjusted for X 

 d.f. S.S. M.S. 



92 126.255 1.3723 



Samples 



+ Error 94 233574.358 -l8l3.453 140.484 



Samples 

 adjusted 



F = O.U N.S. 



93 126.404 

 1 0.149 0.149 



26 



