73 



"taken as arising from my instruments being free, while 

 those in Platz are in a position wliere they must receive a 

 good deal of heat from surrounding houses. 



I must point out that we are now getting together a 

 considerable number of figures of these high climates at 

 other hours than the official ones, so that gradually we shall 

 see the course through the day. The nine a.m. observations 

 have been made by me in Davos both during the winter 

 1870-71 and this winter. During 1882-83 winter, I took 

 it in St. Moritz, and Dr. Wise registered it in Wiesen 1882-3, 

 and in Maloja 1883-4. Many patients who could not under- 

 take to keep a record at seven a.m. could do so at nine a.m., 

 and therefore it is important to know its relation to other 

 hours. In St. Moritz I also made observations at three p.m., 

 and Dr. Wise has done so in Wiesen and Maloja, but it is 

 rather to be regretted that none of Dr. Wise's observations 

 are taken at the same time as in the official Swiss stations. 



The mean winter temperature in Davos Platz taken from 

 12 years' observations is November — 2-4 Cent.; December - 

 6'1 C; January — 7"7 C; February — 41 C; so that com- 

 paring this winter in Davos Platz it is nearly two degrees 

 centigrade warmer than the average. 



Wind. 

 The wind was again measured at about 6 feet from the 

 ground, in order to see approximately the conditions to 

 which patients are exposed. The position though about 50 

 metres from the hotel we can only look upon as representing 

 a sheltered part of Davos Dorfli. As we have previously had 

 occasion to notice the choice of position is an extremely 

 difficult question, and almost any result may be obtained, 

 according to the position taken, for as a rule the wind is 

 only a valley wind, that is to say, is quite independent of 

 the upper currents, and it will therefore be readily under- 

 stood that its exact direction varies very considerably in 



