Why did Mendeleev not include einsteinium in his periodic table of 1871? Periodic Table: 2 3 4

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Why did Mendeleev not include einsteinium in his periodic table of 1871?

Periodic Table:

2 3 4 10 6 3 7 11 Li 6.94 1 IA Na 22.99 19 37 5 Rb K 39.10 al 55 4 87 2 IIA Fr (223) Be 9.01 12 Mg 24.31 Sr 

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