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Bert and Bill
The development story of a pair of male identical twins which follows here is based on five different pieces of evidence and their comparison with each other:
1The detailed direct observation made in The Hampstead Nursery between their fourth month and their fourth year (Bert: 1942 to April, 1945; Bill: 1942 to September, 1945) and published in my book on Twins(1952) under the names of Bert and Bill.
2An inquiry in 1953 by Mr. Shields with special regard to the twins' identical births. Mr. Shields also traced the course of their external lives from the time of their departure from the Hampstead Nursery to their appearance in the Home for Maladjusted Children