length clusrcl the heat from the mess-deck below wanned the Magnetic House. Again, the snow-drift on 

 the upper deck used often to block the door, and prevent it from being closed tightly. 



The height of the cisterns of these barometers was aliout the same as when hung in the loliliv, viz., 

 9 feet. The instruments were in an ideal place, except for the temperatures being low at times. Except 

 the observer, no one used the Magnetic House, so that the barometers were free from any rough or 

 unnecessary handling. 



On the journey back to England the barometer was still kept in the Magnetic Kootn, but, owing to the 

 observations for " Dip," the cistern being made of iron, the instrument had to be moved each day during 

 the times that the magnetic observations were being taken. 



DRY-BULB THERMOMKTER. 



This instrument, placed in the screen with the Wet-Bulb and with the Maximum and Minimum 

 Thermometers, was read every two hours. If the temperature at the time was below - 40", the readings 

 of the dry-bulb thermometer, which was a mercurial one, were not taken, but the present time readings of 

 the spirit maximum as well as the minimum were read instead. Sometimes the mercury was not frozen 

 until below - 40.* 



Fig. !. Thermometer screens and anemometers. 



It was noticed that the present reading of the spirit minimum often showed a lower reading than the 

 mercurial, and at one time the two were recorded and entered in the register for the information of the 

 authorities at home. The readings of the thermometer exposed outside and of the dry bull) in the screen 

 were seldom similar, and at one time I thought the screen seemed to retain the heat from the sunshine 

 during the day and more especially on calm nights, when the* sun was below the horizon. Radiation 

 would, of course, affect the outside thermometer, and would account for the difference. 



* See Note by Dr. J. A. HAHKKB, p. 15. 



