Abstract
Tiie present work was undertaken to ascertain the area of distribution of the different arteries of the brain, when they were injected simultaneously under the same pressure with gelatine containing soluble colours, in place of the usual method of injecting the arteries singly and successively with insoluble colours held in suspension. The work is illustrated by photographs of the different sections of the brains, reproduced in colours by the chromo-collotype process. The number of brains which have been injected is 87.