The principal difficulties in pushing far northward may be summed up in a few words. The attempt must be made in summer (the Arctic day), when the ice is liable to break up. A boat must therefore be carried, and this makes the sledge train heavy. The ice to be crossed is extremely rough, and explorers have not been able to find smoother spots of any considerable size. By rough we mean that it is covered with deep rifts, blocks and snow drifts from five to twenty feet or more in height, and these impediments cover the surface so closely as to leave no alternative but a slow tugging of the sledges over the most available parts of them. The English expedition found these drifts to lie directly across their course, having been formed by a west wind. The labor of crossing them is performed with the thermometer far below the freezing point. There is no fire, provisions have to be carefully husbanded, sleep is dangerous unless frequently broken, and if one of the party breaks down, the strength of the whole is seriously diminished, while its task is greatly increased. Such has been the history of exploration up to within 400 miles of the pole, and it is at least probable that many of these difficulties will be intensified as that point is reached. The north pole may now be considered to occupy the centre of an area 800 miles in diameter, the condition of things within which it is not possible even to conjecture. We may plausibly suppose (1) that it is not land, for the ice of the Arctic sea is never more than 150 feet thick, and there are no glaciers; (2) that it is a shallow sea; and (3) that the precipitation of moisture in the centre must be considerable, as the ice is moving in all directions from the centre during the summer. The theory of an open sea at the pole is now discarded by most scientific men, and, we believe, by all experienced explorers except Hayes. In the present state of knowledge it rests upon the presumption that the polar sea is very shallow, so that the deep and warm currents which are known to enter the Arctic ocean may be forced to the surface there; and that the ice drift removes the ice as fast as it forms.
EXPLORATION NOTES.
The Portuguese government has decided to spend $100,000 on a scientific expedition to Central Africa.
Every exploring expedition across the continent of Australia has to taste the extreme difficulties of travel in the barren parts of that extraordinary country. Mr. Giles, the last explorer, says: "From the end of the watershed in longitude 120 deg. 20 min., the latitude being near the 24th parallel, to the Rawlinson range of my last horse expedition, in longitude 127 deg., the country was all open spinifex sandhill desert. At starting into the desert most of the camels were continually poisoned, the plant which poisoned them not being allied in any way to the poison plants of the settled districts of Western Australia. I now know it well, and have brought specimens. The longest stretch without water was a ten days' march. One old cow camel died after reaching the water. We had some rain on May 8 before reaching the Ashburton, and some of it must have extended into the desert. It was the only chance water we obtained."
Prof. Nordenskiold, who sailed from Norway to the mouth of the river Jenesei, in Siberia, is now preparing for a voyage from that river along the shore of the Arctic sea to Behrings straits. It may be that the navigation of the Arctic sea, which is impossible away from land, can be accomplished in its neighborhood. The return journey will be made by way of China, India, and the Suez canal, the whole forming the most remarkable voyage ever undertaken by one ship.
Bradford, Pennsylvania, is lighted with gas from a well situated about two miles from town.
In the United States heavy rains are less frequent between 4:35 p.m. and 11 p.m than at any other part of the day. The greatest number are between 7:35 a.m. and 4:35 p.m.
In the Alps the snow line is 8,900 feet high on the northern side and 9,200 feet on the southern. In the Himalayas it is 16,600 feet on the northern side and 16,200 feet on the southern.