The way the Hindus practice this would be very difficult for this country, because they do it from their childhood, and their lungs are prepared for it. Here it is well to begin with four seconds, and slowly increase. Draw in four seconds, hold in sixteen seconds, then throw out in eight seconds. This makes one Pranayama. At the same time think of the basic lotus, triangular in form; concentrate the mind on that centre. The imagination can help you a great deal. The next breathing is slowly drawing the breath in, and then immediately throwing it out slowly, and then stopping the breath out, using the same numbers. The only difference is that in the first case the breath was held in, and in the second, held out. This last is the easier one. The breathing in which you hold the breath in the lungs must not be practiced too much. Do it only four times in the morning, and four times in the evening. Then you can slowly increase the time and number. You will find that you have the power to do so, and that you take pleasure in it. So very carefully and cautiously increase as you feel that you have the power, to six instead of four. It may injure you if you practice it irregularly.