Some preliminary work was also started in a search for a suitable
injection material to be used in the tree medication experiments.
It is evident from the chemical investigation that a suitable
injection material must not coagulate the excessive tannin and other
colloids in the wood and bark, and that it must be able to penetrate
cutin in suberin in order to diffuse properly through the infected
area. A brief investigation of a modified chlorine solution showed that
it fulfilled these requirements in many respects, but its value in
treating trees has not been determined.