3l T. H. MORGAN. 



There was also another point that I wished to test by means 

 of these experiments, namely, whether there is any correspond- 

 ence between normal and abnormal development of the eggs and 

 the proportion of the eggs that are fertilized. It will be recalled 

 in this connection that Castle found that those cases of Ciona in- 

 testinalis in which self-fertilization occurs development is abnor- 

 mal. On the contrary, I found that self- fertilized eggs often give 

 rise to normal embryos. I wished, therefore, to see whether in 

 cross-fertilized eggs there is any relation between the number 

 fertilized and the condition of the embryos. In the following 

 table the kinds of embryos that developed from the eggs given 

 in the preceding table are recorded. The abnormal records gen- 

 erally indicate tadpoles that were bent, or crooked, or otherwise 



abnormal in shape. 



TABLE I. Continued. 



The table shows that all of the tadpoles were abnormal, de- 

 spite the fact that a large percentage of the eggs was fertilized 

 in several cases. The next table gives the results of a second 

 experiment. 



TABLE II. 



A a A' 1 io b A c 40 A' 1 50 A e o A' 40 



B" 30 B b B c 90 B d 80 B e I B f 25 



C a 90 C 1 ' 95 C C d 99 C e 100 C r 100 



D a 90 D 1 ' 90 D c 80 D d D e i D f 99 



E a o E" 40 E c 25 E d 50 E e E f o 



F a i F''4o F c 8o F d 15 F e o F f 



The A and the E-eggs were only moderately good, the B, C, 



D, and F-eggs were very good. The sperm in all the sets gave 

 very good results with at least some of the eggs. The excep- 

 tional cases found in this series were as follows. The a-sperm 

 did poorly with B, very poorly with F, and gave nothing with 



E, although with C and with D 90 per cent, of the eggs were 

 fertilized. The b-sperm also gave varying results, although the 

 extremes were not so marked ; and this holds to even a less de- 

 gree with the c -sperm. The c-sperm gave exceptionally good 



