Newly hatched chicks were randomly allocated into six groups, and each group 
was given a different feed supplement. Their weights in grams after six weeks 
are given along with feed types.

Source
Anonymous (1948) Biometrika, 35, 214. 

References
McNeil, D. R. (1977) Interactive Data Analysis. New York: Wiley. 

There are 71 observations in the dataset, each including the following
Variables for a single chick:

    observation number
    weight in grams at 6 weeks
    feed type