With the exception of some early photogrpahs taken to determine the space group, all the photographs were taken from a recrystallized sample. N-p-Brome-2, 2-diphenylvinylideamine (BDPV) was recrystallized from petroleum ether (80-100). The original sample melts at 83-84°C. The recrystallized sample melts at 83-83°C. The linear absorption coefficient u of BDPV for Cu Ka x-rays of wave length 1.5418 7', . is 36.73 cm.