By increasing the number of lambs under one month old to 15 -(the maximum available) it was found that average cell volume for this groups was , 35.5 cubic microns as compared to the average of 27.4 given in Fig. 1 for sheepand lambs over three months. From these two groups it was possible to build a four -fold table, as follows :Cell Size Cell Size Above 30 c. µ Below 31 c. µ Lambs under one month ...