_Lumbar and suboccipital_ punctures immediately after the experiments showed a considerable _increase in fluid pressure_. On the average it amounted to between 50 and 60 mm. In one case, an _increase to 420 mm._ was seen. The protein values were always normal. Cell increases did not appear, likewise no abnormal deviation of the colloidal gold curve was observed. The meaning of these findings for therapy is still to be discussed later. _V. Recovery After Cooling and Its Dependence Upon Physiotherapeutic Measures_ The important fact has already been referred to that after rescue from the cold water, the body temperature sinks further and so a further temperature reduction of 4° C. [7° F.] may take place. As was likewise emphasized, this may occur as a postphenomenon not only when low temperatures have been obtained already during the experiments, but it can be noted also at final temperatures of 35° C. [95° F.]. A dependence of this after-drop on the duration of the experiment could not be established; as a result it is difficult to calculate in advance. This fact becomes of great importance for practical measures; on the other hand it makes it difficult to gain an insight into the manner in which various physiotherapeutic measures affect the arresting of this after-drop and the recovery of the body temperature. Only because of the large number of the experiments was it possible to obtain well-founded concepts of this. The _flattest rise of the body temperature_ was to be observed when the subject was merely dried off, wrapped in warm cover, and left to himself after removal from the water. The recovery is greatly accelerated if the subject is placed in a hot bath as soon as possible after the removal of the wet articles of clothing. Warming under a light cradle assisted the temperature rise. Vigorous massage had a favorable effect, however, only if it was preceded by treatment in a hot bath or light cradle. _In no case was it established that there was any indication of bad effects from the hot water or the light cradle, or that the subject had been harmed in any way._ On the other hand, it was observed in three cases that a hot bath had doubtless a life saving effect. In two of these cases there had been complete cessation of heart and breathing action, and in one case the heart had stopped for several seconds after a markedly slackened irregularity before the subject was placed into water of not more than 50° C. [122° F.]. _As a result of this we can discard all traditional objections to a sudden rewarming._