i9«] MAGNESIUM FLASHLIGHT 301 
much coarser teeth in the saw edge — perhaps also the 
blade should be thinner. 
We must go on with this hut building till we get good 
at it. I'm sure it's going to be a useful art. 
We only did three courses of blocks when tea-time 
arrived, and light was not good enough to proceed 
after tea. 
Sunday afternoon for the men means a * stretch off 
the land.' 
I went over the floe on ski. The best possible surface 
after the late winds as far as Inaccessible Island. Here, 
and doubtless in most places along the shore, this, the first 
week of June, may be noted as the date by which the wet, 
sticky salt crystals become covered and the surface possible 
for wood runners. Beyond the island the snow is still 
very thin, barely covering the ice flowers, and the surface 
is still bad. 
There has been quite a small landslide on the S. side 
of the Island ; seven or eight blocks of rock, one or two 
tons in weight, have dropped on to the floe, an interesting 
instance of the possibility of transport by sea ice. 
Ponting has been out to the bergs photographing by 
flashlight. As I passed south of the Island with its whole 
mass between myself and the photographer I saw the 
flashes of magnesium light, having all the appearance of 
lightning. The light illuminated the sky and apparently 
objects at a great distance from the camera. It is evident 
that there may be very great possibilities in the use of 
this light for signalling purposes, and I propose to have 
some experiments. 
