1. Rind hardness was measured for five varieties from 100 selected stalks in 1949–50 and for three varieties from all millable cane within 1/40th of an acre in 1950–51.
2. (a) Sector, clump, unit and row as hierarchies were not found to be as important as internode or stalk.
(b) Unit brought in more variation within the sample than the clumps.
3. The size of sample by the first method would be 25, 100 and 500 well-developed stalks, the best of a clump, to estimate this character within margin of 5%, 21/2% and 1% error of the mean. For the second method, the number of observations required would be 50, 250 and 1,250 taken from the four hierarchies according to a certain plan.
4. All measurements should be done on the side opposite the bud at the mid-point of middle internodes.