The daily polar sledging ration for one man has been concentrated to a figure just above two pounds in weight, For instance, in recent Antarctic expeditions, Scott, in 1903, used 34.7 ozs., Shackleton in 1908 used 34.82 ozs. and our own amounted to 34.25 ozs. Exclusive of tea, pepper and salt, Shackleton's ration and that adopted by Wild at the Western Base and ourselves in Adelie Land were identical—34 ozs. Reverting to earlier explorers, for the sake of comparisons, McClintock in 1850 brought his minimum down to 42 ozs., Nares in 1875 to 40 ozs., Greely in 1882 to 41.75 ozs., and Abruzzi in 1900 to 43.5 ozs.
Our allowance was made up as follows, the relative amounts in the daily sledging ration for one man being stated: plasmon biscuit, 12 ozs.; pemmican, 8 ozs.; butter, 2 ozs.; plasmon chocolate, 2 ozs.; glaxo (dried milk), 5 ozs.; sugar, 4 ozs.; cocoa, 1 oz.; tea,.25 oz. It will be instructive to make a short note on each item.
Plasmon biscuit was made of the best flour mixed with 30 per cent. of plasmon powder. Each biscuit weighed 2.25 ozs., and was made specially thick and hard to resist shaking and bumping in transit as well as the rough usage of a sledging journey. The effect of the high percentage of plasmon, apart from its nutritive value, was to impart additional toughness to the biscuit, which tested our teeth so severely that we should have preferred something less like a geological specimen and more like ordinary "hard tack," The favourite method of dealing with these biscuits was to smash them with an ice-axe or nibble them into small pieces and treat the fragments for a while to the solvent action of hot cocoa. Two important proteins were present in this food: plasmon, a trade-name for casein, the chief protein of milk, and gluten, a mixture of proteins in flour.
The pemmican we used consisted of powdered dried beef (containing the important protein, myosin) and 50 per cent. of pure fat in the form of lard. The large content of fat contributes to its high caloric value, so that it is regularly included in sledging diets. Hoosh is a stodgy, porridge-like mixture of pemmican, dried biscuit and water, brought to the boil and served hot. Some men prefer it cooler and more dilute, and to this end dig up snow from the floor of the tent with their spoons, and mix it in until the hoosh is "to taste," Eating hoosh is a heightened form of bliss which no sledger can ever forget.
Glaxo is a proprietary food preparation of dried milk, manufactured in New Zealand. It is without doubt an ideal food for any climate where concentration is desirable and asepsis cannot be neglected. The value of milk as an all-round food is well known. It contains protein as casein, fat as cream and in fine globules, carbohydrate as lactose (milk sugar) and mineral substances whose importance is becoming more recognized. At the Western Base, Wild's party invented glaxo biscuits; an unbaked mixture of flour and dried milk, which were in themselves a big inducement to go sledging. At the Hut, making milk from the dried powder required some little experience. Cold water was added to the dried powder, a paste was made and warm or hot water poured in until the milk was at the required strength. One of the professional "touches" was to aerate the milk, after mixing, by pouring it from jug to jug.
Butter, although it contains nearly 20 per cent. of water is a food of high heat-value and is certainly more easily digested than fat, such as dripping, with a higher melting-point. Ours was fresh Victorian butter, packed in the ordinary export boxes, and carried to the Antarctic on the open bridge of the Aurora. With a sheath-knife, the sledging cook cut off three small chunks of two ounces each from the frozen butter every day at lunch. To show how the appetite is affected by extreme cold, one feels that butter is a wholesome thing just in itself, being more inclined to eat a pound than two ounces.
Sugar—the carbohydrate, sucrose—has special qualities as a food since it is quickly assimilated, imparting within a few minutes fresh energy for muscular exertion. Athletes will support this; in fact, a strong solution of sugar in water is used as a stimulant in long-distance running and other feats of endurance. Wild, for instance, found as a matter of experience that chocolate was preferable to cheese as a sledging food, even though similar weights had approximately the same food-value.
Cocoa and tea were the two sledging beverages. The cocoa was used for two meals, the first and the last in the day, and the tea for lunch. Both contain stimulating alkaloids, theobromine and caffeine, and fat is a notable constituent of cocoa. Of course, their chief nourishing value, as far as we were concerned, lay in the glaxo and sugar added.
Lastly, plasmon chocolate is a preparation of pure chocolate (a mixture of ground cocoa, white sugar and starch) with the addition of 10 per cent. of plasmon.
As food for the dogs, there was nothing better than dried seal-steaks with the addition of a little blubber. Ordinary pemmican is readily eaten, but not appreciated by the dogs in the same way as seal meat. To save weight, the meat was dried over the stove without heating it sufficiently to cook it. By this measure, almost 50 per cent. in weight was saved.