I is the next letter.
L
E
Next three letters are: e n d
Between A and D are two letters, between D and E are no letters, between E and H are two letters, and between H and I are no letters. Therefore, there would be two letters between I and the next letter, so it would be L.
The sequence alternates between skipping letters. Starting with "j," it skips "i" to "h," then skips "f" to "g," and skips "e" to "d." Following this pattern, the next letter after "d" would skip "c," resulting in "b."
E. H. D. Sewell died in 1947.
E. H. D. Sewell was born in 1872.
The next letter is D. The pattern is every fourth letter. Ie. a b c D e f g H i j k L m n o P and so on...
The obvious one is "L" as you start with A then add 3 letters = D, then add 1 letter = E, then add 3 letters = H, then add 1 letter = I, then add 3 letters = L.
D E H. Frear has written: 'Pesticide handbook - Entoma'
D