Our worst trouble with the dogs came from far away—probably from Asia. There are references in Scott's diary to four dogs as attacked by a mysterious disease during our first year in the South: one of these dogs died within two minutes. We lost many more dogs the last year, and Atkinson has given me the following memorandum upon the parasite, a nematode worm, which was discovered later to be the cause of the trouble:
"Filaria immitis.—A certain proportion of the dogs became infected with this nematode, and it was the cause of their death, mainly in the second year. It was present at the time the expedition started (1910) all down the Pacific side of Asia and Papua, and there was an examination microscopically of all dogs imported at this time into New Zealand. The secondary host is the mosquito Culex.
"The symptoms varied. The onset was usually with intense pain, during which the animal yelled and groaned: this was cardiac in origin and referable to the presence of the mature form in the beast. There was marked haematuria, and the animals were anaemic from actual loss of haemoglobins. In nearly all cases there was paralysis affecting the hindquarters during the later stages, which tended to spread upwards and finally ended in death.
"The probable place of infection was Vladivostok before the dogs were put on board ship and deported to New Zealand. The only method of coping with the disease is prevention of infection in infected areas. It is probable that the mosquitoes would not bite after the dog's coat had been rubbed with paraffin: or mosquito netting might be placed over the kennels, especially at night time. The larval forms were found microscopically in the blood, and one mature form in the heart."
We were too careful about killing animals. I have explained how Campbell's party was landed at Evans Coves. Some of the party wanted to kill some seals on the off chance of the ship not turning up to relieve them. This was before they were in any way alarmed. But it was decided that life might be taken unnecessarily if they did this—and that winter this party nearly died of starvation. And yet this
