deletions | additions       diff --git a/para 4.tex b/para 4.tex  index 8267485..c326093 100644  --- a/para 4.tex  +++ b/para 4.tex 
...
\begin{enumerate}  \item that when the organisation has once begun to vary, it generally continues to vary for many generations.  \end{enumerate}  No case is on record of a variable being ceasing to be variable under cultivation. Our oldest cultivated plants, such as wheat, still often yield new varieties: our oldest domesticated animals are still capable of rapid improvement or modification.