x 9 i i] GEOLOGY AT HUT POINT 209 
Yesterday afternoon we climbed Observation Hill 
to see some examples of spheroidal weathering — Wilson 
knew of them and guided. The geologists state that 
they indicate a columnar structure, the tops of the 
columns being weathered out. 
The specimens we saw were very perfect. Had some 
interesting instruction in geology in the evening. I 
should not regret a stay here with our two geologists if 
only the weather would allow us to get about. 
This morning the wind moderated and went to the 
S.E. ; the sea naturally fell quickly. The temperature this 
morning was + 17 0 ; minimum + But now the 
wind is increasing from the S.E. and it is momentarily 
getting colder. 
Thursday, March 23, a.m. — No signs of depot party, 
which to-night will have been a week absent. On Tuesday 
afternoon we went up to the Big Boulder above Ski slope. 
The geologists were interested, and we others learnt some- 
thing of olivines, green in crystal form or oxidized to 
bright red, granites or granulites or quartzites, horn- 
blende and felspars, ferrous and ferric oxides of lava 
acid, basic, plutonic, igneous, eruptive — schists, basalts, 
&c. All such things I must get clearer in my mind.* 
Tuesday afternoon a cold S.E. wind commenced and 
blew all night. 
* As a step towards ' getting these things clearer ' in his mind 
two spare pages of the diary are rilled with neat tables, showing 
the main classes into which rocks are divided, and their natural sub- 
divisions — the sedimentary, according to mode of deposition, chemical, 
organic, or aqueous ; the metamorphic, according to the kind of rock 
altered by heat ; the igneous, according to their chemical composition. 
vol. 1. p 
