Journal of Embryology and Experimental Morphology Volume 23, Part 1, February 1970

On page 27, Table 3 :

For ‘M = unexpanded early blastocyst…’

Read ‘M = morula; U = unexpanded early blastocyst…’

On page 27, paragraph 4, line 3 :

For ‘…58% of the eggs transferred…’

Read ‘…51 % of the eggs transferred…’