the eggs had hatched. Of the seven remaining eggs one was a winter egg, three were dead parthenogenetic eggs and the other three contained living embryos which were apparently unable to break through the egg envelope.
March 14, at 8:qo p.m., twenty eggs were isolated and allowed to remain undisturbed. At 9:10 pm., these eggs were centrifuged in the same way and treated as Lot A. March 15, at 1:30 p. m., seventeen young normal females were in the dish and three unhatched eggs which contained living embryos. At 9 pm., two o f . these eggs had produced normal females but the other was still unhatched.
March 14, at 8:45 p.m., thirty eggs were isolated and allowed to remain undisturbed. At 9:45 p.m., these eggs, in some of which the first cleavage and in others the second and third cleavage had appeared, were centrifuged and treated as Lot A.
March 15, at 1:40 p.m., fourteen normal young females were removed from the dish and sixteen unhatched eggs remained At 9 p.m., seven other normal young females were removed.
March 16, at 10 a . m , two other normal young females were removed.
One was a winter egg, two were dead parthenogenetic eggs and four contained living embryos.