6. After a person has sunk to the bottom, if the water be smooth, the exact position where the body lies may be known by the air bubbles, which will occasionally rise to the surface, allowance being, of course, made for the motion of the water, if in a tide way or stream, which will have carried the bubbles out of a perpendicular course in rising to the surface. Oftentimes a body may be regained from the bottom, before too late for recovery, by diving for it in the direction indicated by these bubbles. 7. On rescuing a person by diving to the bottom, the hair of the head should be seized by one hand only, and the other used in conjunction with the feet in raising yourself and the drowning person to the surface. 8. If in the sea, it may sometimes be a great error to try to get to land. If there be a strong "outsetting tide" and you are swimming either by yourself or having hold of a person who cannot swim, then get on your back and float till help comes. Many a man exhausts himself by stemming the billows for the shore on a back-going tide, and sinks in the effort, when, if he had floated, a boat or other aid might have been obtained. 9. These instructions apply alike to all circumstances, whether as regards the roughest sea or smooth water. FOOTNOTES: [1] Changing hands will be found unnecessary after some practice; the tongue, however, must not be released. [2] A child or very delicate patient must, of course, be more gently handled. [3] If there is stuck through the tongue a pin long enough to rest against the teeth and keep the tongue out of the mouth, the desired effect may be obtained.--EDITOR. CHAPTER II =Heat Stroke and Electric Shock= _How Persons are Overcome by Heat--Treatment of Sunstroke--Peculiar Cases--Dangers of Electric Shocks--How Death is Caused--Rules and Precautions._ =HEAT EXHAUSTION.= _First Aid Rule 1.--Carry patient flat and lay in shade. Loosen clothes at neck and waist._ _Rule 2.--Raise head and give him (a) teaspoonful of essence of ginger in glass of hot water, or give him (b) half a cup of hot coffee, clear._ _Rule 3.--Put him to bed._ =HEAT STROKE.= _First Aid Rule 1.--Send for physician._ _Rule 2.--Remove quickly to shady place, loosening clothes on the way._ _Rule 3.--Strip naked and put on wire mattress (or canvas cot), if obtainable._ _Rule 4.--Sprinkle with ice water from watering pot, or dash it out of basin with hand._ _Rule 5.--Dip sheet in ice water and tuck it snugly about patient._ _Rule 6.--Sprinkle outside of sheet with ice water; rub body, through the sheet, with piece of ice. Put piece of ice to nape of neck._ _Rule 7.--When temperature falls to 98.5 deg. F. put to bed with ice cap on head._ =SUNSTROKE.=--There are two very distinct types of sunstroke: (1) Heat exhaustion or heat prostration. (2) Heat stroke.