12 



grammes lx?ing the amount lost in the interval, which could only he by evaporation. Sometimes the dishes 

 weighed a trifle more than the day before, and this I put down to the fact of a fall of very minute ice 

 crystals adhering to the ice surface. Any loose drift or snow \v:is brushed off before the dishes were 

 weighed. 



It will be noticed that the differences are seldom actually the same for each dish, and this is rather 

 singular, seeing that they were placed side by side, and presumably what affected one dish should also 

 have atl'eeted the other. In summer it was found impossible to continue these observations, for the ice in 

 the dishes was then melted, and it was most difficult to weigh them without spilling the water. 



K'.UN OR SNOW GAUGE. 



This instrument was placed on the snow at a little distance from the Meteorological Screen (fig. 2). During 

 the ordinary snow-fall it worked well, and the amount of snow was recorded at the actual time it was 

 taken. During the southerly gales, which invariably brought with them a' heavy snow-fall as well as 

 dense drift, this instrument was useless, as any other instrument of a similar kind would have been under 

 those circumstances. Very often after one of these gales it became exceedingly difficult to find the 

 instrument at all, since it might be buried under three and four feet of snow, and it was only because we 

 knew its exact position and dug down to it that we did not lose it more than once. For some time the 

 snow-fall was so small that it was measured in cubic centimetres and entered in the fair register in that 

 scale. The bay in which we were situated formed a regtdar cone for the full strength of the southerly 

 gales, and the drift which accumulated all round and about the ship, or any other obstacle, was enormous. 



SUNSHINE RECORDER, 



This instrument was placed on a box on the summit of Hut Point about 40 feet above the sea-level. 

 The cards were shifted at Noon. Only since the return of the expedition have I ascertained that the cards 

 were placed in the instrument inaccurately, which is the reason of the mark of the burn not going straight 

 and at times jumping up or down on the card. 



In the early Spring some few hours of sunlight could not be recorded, because the rays were cut off 

 from us by hills in the vicinity Observation Hill, Crater Hill, Arrival Heights. This can be seen from 

 the map of our Winter Quarters (p. 16). 



The manipulation of small screws, &c., connected with the sunshine recorder, and the very exposed 

 position of the instrument, made it by no means a pleasing duty to shift the cards, and often involved 

 frost-bitten fingers. The cards were not kept shipped during the first Winter, but. during the second 

 Winter a card was in the whole time and took the first record. 



OZONE OBSEUVATIONS. 



For a long time during our cruise no attempt was made to observe ozone; it was such a very doubtful 

 observation. Towards the end of our second Winter, however, I decided to try and see what effect would 

 be produced on the papers supplied. One of these was placed in a small tea-strainer and hung in one of 

 the meteorological screens, and when taken out was carried on board in a glass tube and placed in water. 

 The depth of tint obtained was then compared with the scale supplied. 



To test whether the fact of doing this in the ward room affected the result, one of the papers was hung 

 in the mess all night, and on being placed in the water next morning, it was found to remain clean white. 

 Also at times a paper was taken direct from the tin box in which they were kept, and was placed in water, 

 but it always showed clean white, very different from the tint produced by exposure in the open air. The 

 papers seemed most affected during heavy southerly gales, and were c|iiito brown before being put into 

 water. The length of time the paper was exposed was always noted, and also the colour of the paper 

 before being immersed in water. 



