Mendel began his research well
prepared with cross experiments
on simple features.
This way he proceeded to gradually
more complex experiments. He 
also worked with repeatable 
experiments. Experiments, for that 
matter, that also led to quantitative
results.
       
This practice of science so common
nowadays was not so usual at all at 
that time.
       
Mendel wanted to be certain,
before starting his cross
experiments, that his material to
begin with would be homozygous
(pure breed).
And indeed, it took already some 
time 'only' to produce this
material before he actually could
do the first crosses.
(One could call this way to proceed 
easily also a method of  "Technological
Design"- avant la lettre ...)
      
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