36 INLAND FISHEKIES. 



An examiuatiou of the experimeuts here tabulated shows some 

 interesting- results which may be briefly stated as follows. 



Of the three classes of clams which were more than one year old 

 the smaller specimens were most successful in burrowing, the 

 middle ones next, and the largest clams least successful. The 

 fourth class composed of specimens a few months old were slightly 

 less successful than the third. 



Of the I (50-70nim.) class, under all conditions. .70 per cent, burrowed. 

 II (.35-50mm.) 85 per cent. " 



III (25-35mm.) 90.5 per cent. 



IV (20-30mm., 1900) 87.7 per cent. 



The effects of the varying conditions may be stated as follows : 



(a) Planted immediately after digging (1 hour or less). 



Class 1 72 per cent, burrowed." 



" II 96 percent. " 



" III 100 per cent. 



" ly 97 per cent. 



Average per cent. = 91 .2 



(h) Dry 24 hours.. 



Class 1 68 per cent, burrowed. 



" II 78.6 per cent. " 



" III 97 . 3 per cent. " 



" IV 96 per cent. " 



Average per cent. =84.9 



(c) Kept in water 24 hours between digging and sowing. 



Class I "tO.G per cent, burrowed. 



" II 84.0 per cent. " 



" III 77 .3 per cent. " 



" IV •. 73 . 3 per cent. " 



Average per cent. = 76.3 



