232 British Antarctic Expedition. 
otherwise the life of insects would not have been 
possible. Perchance we had experienced a eom 
paratively cold winter? The insects were of three 
distinct types, and on return to Camp Ridley the 
doctor made some excellent microscopic preparations 
of them. 
The Finn Savio, evidently put on his mettle by 
the doctor's discovery, shortly afterwards triumphantly 
entered Camp Ridley with an ordinary blow-fly ; and, 
to say the truth, it did startle us at fest until we 
found that it was a dead stowaway in a jam-box 
from London ! 
It is important and curious that in both the 
marine fauna collection, and in the AZeae collection, 
specimens were found proving the existence of 
bi-polarity; while in the land fauna, as far as we 
know, such do not exist. The existence of organisms 
does not develop from the presence of the possibility 
of existence for these, but because the element 
necessary for the development of these organisms 
was brought into conditions which favoured its 
development into a complete organism. It seems 
thus that the fount whence the element of these 
organisms rises exists both within the Arctic and Ant- 
arctic Circles, apparently without any communication 
through the intermediary zones. Quite different 
appear the land fauna, where bi-polarity does not 
exist. There are places on the Northern and Southern 
Hemispheres which seem to be ruled by the same 
climatic conditions and by the same meteorological 
conditions, and where any one might expect the 
same species to exist; but there «musi. be lacking 
some conditions in the one place which are necessary 
