1893.] Organism without Characteristics of Mother. 229 
If the nuclear substance alone is the bearer of the parental 
qualities, then larva of the pure Echinus type will be produced 
(Fig. 1). It is clear that in the experiment this conclusion can 
only be proved, if the bastards produced from fertilized eggs 
(we will call these the genuine Bastard larve) give a middle- 
form standing between the larve of the two parental species, 
For it is conceivable that the particular structures of the two 
Fig. 3. 
Larva of bastard of Echinus alee 8 and Sphaerechinus granularis Q . 
species might not be able to commingle, so that the larvæ 
would, according to their surroundings, develop either the 
paternal or maternal qualities alone (the qualities of the 
other parent in each case remaining latent). In this case there 
would be no true bastard. 
I have reared such larvæ in great numbers and from many 
different individuals, and have in all certainly seen more than 
