The tackle's duties towards the end have been partially described in dwelling upon the work of the latter, but there is plenty of detail to be studied. One of the first things to impress upon the tackle is, that he must watch the ball, not only upon the pass from the quarter, but also after it settles in the runner's arms, for the most successful double or combination passes are those which draw the tackle in towards the centre and give the second recipient of the ball only the end to pass. It has been too common a mistake of coaches to caution a tackle who has been deceived by this double pass against "going so hard." This is wrong. It soon results in making a slow man of the player, for he hangs back to see if the runner be not about to pass the ball, until he is too late to try for the man before he reaches the rush line; and, with the present system of interference and crowding a runner after he reaches the rush line, there is no chance to stop him short of three, and it may very likely be five, yards. The proper coaching is to send him through on the jump, with his eyes open for tricks. Let him take a step or two towards the runner, so that, if no second pass be made, the tackle will be sure to meet him before he reaches the rush line, and not after it. This method of coaching makes not only sharp tackles, but quick and clever ones, with plenty of independence, which will be found a most excellent quality. As regards the relations between the tackle and guard, they are best defined by saying that the guard expects to receive the assistance of the tackle in all cases requiring agility, while in cases requiring weight the guard is equally ready to lend assistance to the tackle. [Illustration: WYLLYS TERRY. Yale.]