Pupils should guard against over-exertion; and, above all things, should not exercise violently. It will be found convenient to let each arm (not both arms) move once in a second. Thus, for example, the time of ten movements with each arm of the first exercise would be twenty seconds. As a general rule, this time will be found to give just the exercise that is needed. Faster movements are not recommended for either young or old. Be careful also not to jerk the movements. Always exercise easily and gracefully, and when contracting the muscles take care _not to hold the breath_. Many pupils are inclined to do this unconsciously when bringing their minds to bear upon the muscles, but it is quite wrong, and the tendency must be striven against until it is overcome. In one or two exercises, as will be seen on the chart, there are special instructions with regard to the breath; in all the others the breathing should be perfectly natural. TABLE 1. FOR CHILDREN OF BOTH SEXES BETWEEN THE AGES OF SEVEN AND TEN. (_Using one pound dumb-bells only._) When the _maximum_ has been reached, the child should _continue_ to use the same weight bells and the same spring in the “Grip” dumb-bell until it arrives at the age at which it can follow Table No. 2, and so on with the other tables. Increase No. of No. of of Movements. Exercise. Movements (Not to exceed 30 (See Chart.) with each arm. for No. 1, and other Exercises in proportion.) 1 10 One every three days. 2 5 ” ” ” 3 5 ” ” ” 4 4 One every five days. 5 4 ” ” ” 6 10 One every three days. 7 6 One every five days. Exercises 8, 9, and 10 are not advised for young children. 11 5 One every five days. 12 5 ” ” ” 13 1 One every fortnight. 14 5 One every three days. 15 3 One every fortnight. 16 (boys only) 3 ” ” ” 17 10 One every three days. 18 10 ” ” ” TABLE 2. FOR CHILDREN OF BOTH SEXES BETWEEN THE AGES OF TEN AND TWELVE.