134 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY 



spawned in the large pond at the Port Erin Hatchery 

 about the 26th of April, 1906; probably the error in this 



■frequency curi/( 

 \ \~Cuwe of error 



b 17 IB i9 20 2/ 22 23 



Fig. 17. Catch of 95 plaice from near Nelson Buoy, June, 1909. Gp. II J 

 Correspondence with curve of error. 



Z.0 



u 



c 













Smoothed valuer 

 \\Curve of error 



IS 



Qj 



s 



QJ 















to 



ii 















s 



















, 



L 



e / 



CJth 



i n 



cen 



time tre s 



>S ib '7 '8 '9 Zo &> S.2. 23 2 -f 



Fig. 18. Catch of 99 plaice from near Nelson Buoy, June. 1909. Gp. II 2 . 

 Correspondence with curve of error. 



date does not exceed + 14 days. The eggs collected from 

 the pond were, as a rule, put in the incubating boxes, but 



