'Sionnary. The photosynthetic assimilation of 1 CO., has been studied in healthy a,nd miiil(lew-infected barley. The parasite wvas separated from the host by removing the myceliumii with a camel's hai,r brugh. The ethanol soluble mentabolites of the parasite, infected host and healthy host were extracted, separated by paper chronmatography and individually i'den'tified. From this wvork it appears ithat there is a rapid movement of la)bel from host to parasite 'nainly in the form of sucrose which is then quickly metabolized into many combpounds. Tihe (2,16,20), and a decrease in photosynthetic ability ( 1,17,18). There are also increases in several organicc consti,tuenits (9,12,19) as well as an increase in dry weight (28)