Wednesday, May 24.—­A quiet day with northerly wind; the temperature rose gradually to zero.  Having the night duty, did not go out.  The moon has gone and there is little to attract one out of doors.

Atkinson gave us an interesting little discourse on parasitology, with a brief account of the life history of some ecto- and some endo-parasites—­Nematodes, Trematodes.  He pointed out how that in nearly every case there was a secondary host, how in some cases disease was caused, and in others the presence of the parasite was even helpful.  He acknowledged the small progress that had been made in this study.  He mentioned ankylostomiasis, blood-sucking worms, Bilhartsia (Trematode) attacking bladder (Egypt), Filaria (round tapeworm), Guinea worm, Trichina (pork), and others, pointing to disease caused.

From worms he went to Protozoa-Trypanosomes, sleeping sickness, host tsetse-fly—­showed life history comparatively, propagated in secondary host or encysting in primary host—­similarly malarial germs spread by Anopheles mosquitoes—­all very interesting.

In the discussion following Wilson gave some account of the grouse disease worm, and especially of the interest in finding free living species almost identical; also part of the life of disease worm is free living.  Here we approached a point pressed by Nelson concerning the degeneration consequent on adoption of the parasitic habit.  All parasites seem to have descended from free living beasts.  One asks ‘what is degeneration?’ without receiving a very satisfactory answer.  After all, such terms must be empirical.

Thursday, May 25.—­It has been blowing from south with heavy gusts and snow, temperature extraordinarily high, -6 deg..  This has been a heavy gale.  The weather conditions are certainly very interesting; Simpson has again called attention to the wind in February, March, and April at Cape Evans—­the record shows an extraordinary large percentage of gales.  It is quite certain that we scarcely got a fraction of the wind on the Barrier and doubtful if we got as much at Hut Point.

Friday, May 26.—­A calm and clear day—­a nice change from recent weather.  It makes an enormous difference to the enjoyment of this life if one is able to get out and stretch one’s legs every day.  This morning I went up the Ramp.  No sign of open water, so that my fears for a broken highway in the coming season are now at rest.  In future gales can only be a temporary annoyance—­anxiety as to their result is finally allayed.

This afternoon I searched out ski and ski sticks and went for a short run over the floe.  The surface is quite good since the recent snowfall and wind.  This is satisfactory, as sledging can now be conducted on ordinary lines, and if convenient our parties can pull on ski.  The young ice troubles of April and May have passed away.  It is curious that circumstances caused us to miss them altogether during our stay in the Discovery.