Some progress has been made in this direction, but so far the

main results are certain degradation-products such as aniline
dyes derived from coal tar; salicylic acid; essences of fruits;
etc
Some progress has been made in this direction, but so far the
main results are certain degradation-products such as aniline
dyes derived from coal tar; salicylic acid; essences of fruits;
etc. Still these and many other discoveries of the same nature
do not prove that the laboratory of man can compete with the
laboratory of the living plant cell.