"He was in the process of writing his ""big book"" to present his research when the naturalist Alfred Russel Wallace independently conceived of the principle and described it in an essay he sent to Darwin to forward to Charles Lyell."
“ Eha tamatikwayt tan akatab n “”alkittab net wa maqqoran” i ad isalmad fal farak net alwaq wa id naturalist Alfred Russel Wallace eɣna tasittiɣhal tolas affisar tat daɣ Essay isassaway i Darwin i a ti isassiki i Charles Lyell”