318 T. H. MORGAN. 



the C e were normal, while the one egg fertilized in C f was normal. 

 The D a and D b -eggs gave very abnormal tadpoles, but some of 

 them were normal, while D c and D p and D f were abnormal. 



All of the E and the F-eggs gave abnormal tadpoles. These 

 results show very clearly that there is no necessary relation 

 between the percentage of eggs fertilized and the normal or 

 abnormal development that takes place, although in general good 

 eggs are more likely to produce normal tadpoles, and poor eggs 



abnormal ones. 



TABLE IV. 



A" A" 15 A c - A d - A e - A f - 



B 30 B b B 35 B d 5 B e o B f o 



C n 5 C 1 ' o C I in 10 C' 1 o C e o C f o 



D a 20 D" 10 FJ C 3 D d D e 8 D f o 



E a 100 E" 100 E c 95 E 1 100 E 1 ' E f o 



F" 75 F b I in 10 F c 4 in 26 F' 1 1 in 50 F e o F f 



In this series the A-eggs were not distributed through a mis- 

 take except in two cases. The B and the D-eggs were poorj 1 ; 

 the C-eggs very poor ; the E-eggs were excellent ; and the F- 

 eggs seem to have been good. The a-sperm gave the best 

 results, yet failed to give high percentages with the poorer eggs; 

 and the b-sperm behaved similarly, but did less well with F. 

 The c and the d-sperm were excellent with the e-eggs only, 

 while the e and the f-sperm were poor in all cases, showing, in 

 the case of the E-eggs, which were excellent, that the latter 

 could not fertilize eggs as good as these. 



TABLE V. 



A" A' 1 o A c o A d o A e o A 1 100 



B a 100 IV E K 5 B' 1 o B e o B f 80 



C a 30 C 1 ' 10 C c O> o O o C f So 



D a o D b 2 D c o D d D e o D f 14 



E" 5 E b 25 E c 5 E' 1 o E' E f 30 



F" 75 F' 1 20 F c 2 F d o F e o F f 



This experiment gave some curious results. The A-eggs 

 must have been excellent to judge by A f , yet gave no results in 

 other cases. The B-eggs must have been excellent, but gave 

 good results only with the a and the f-sperm. The C-eggs gave 

 similar results, but few eggs segmented with the a-sperm. The 

 D-eggs must have been poor giving only 14 per cent, with the 

 f-sperm. The E-eggs also gave poor results, 1 and the F-eggs 



1 The E-eggs were polyspermic. 



