And then in later experiments, we found the opposite, that fir was sending more carbon to birch than birch was sending to fir, and this was because the fir was still growing while the birch was leafless.
Și apoi, în experimentele de mai târziu, am constat inversul: bradul trimitea mai mult carbon  mesteacănului decât primea de la acesta, iar asta pentru că bradul încă mai creștea, în timp ce mesteacănul nu avea frunze.