CHAPTER VIII THE FORMS OF TISSUES OR CELL-AGGREGATES ( continued )

shew clearly the manner in which the cells meet one another, always at angles of 120ô¯, and always with the help of five intermediate boundary walls within the eight-celled system; in other cases I have added a slightly altered drawing, so as to shew, with as little change as {379} possible, the arrangement of boundaries which probably actually existed, and gave rise to the appearance which the observer drew. These drawings may be compared with the various diagrams of Fig. 158, in which some seven out of the possible thirteen arrangements of five intermediate partitions (for a system of eight cells) have been already set