"I determined the descent from the summit to Lake Lindeman by carrying the aneroid from the lake to the summit and back again, the interval of time from start to return being about eight hours.

While making the survey from the summit down to the lake I took the angles of depression of each station from the preceding one, and from these angles I deduced the difference of height, which I found to be 1,354 feet, or 117 feet more than that found by the aneroid.

In addition to these I had secreted a prismatic and magnetic compass, a boiling point and aneroid thermometer, and a plane-table which I had constructed for the occasion.

Our course this day was at first over tolerably good country, which gradually became more and more rocky, the ridges increasing in elevation until the aneroid barometer fell to 27.33, giving an altitude of 2400 feet above the sea.

This part of the country I believe to be the most elevated in north-west AustraliaMount Samson having an altitude of not less than 1000 feet above the valley of the Hardey, while Mount Bruce and the mountainous country to the eastward rose to a considerable height above its summit, which, by comparisons from the aneroid barometer, would give not less than 4000 feet for the elevation of those ranges.

I also succeeded in repairing the aneroid barometer, which had been crushed nearly flat by the fall of a horse; fortunately, however, without injury to the vacuum vase.

At the highest point on this day's route the aneroid stood at 29.40, and at the camp 29.55; thermometer, 88 degrees.

Adjusted the aneroid barometer.

Fragments of trap-rock are frequent in the bed of the river, and one specimen contained traces of carbonate of copper; at 6.0 thermometer 92 degrees, aneroid 29.80, at the campsixty feet above the river.

At noon the thermometer stood at 100 degrees in the shade, and the aneroid 29.75forty feet above the river.

The aneroid stood at 29.15; thermometer 94 degrees.

Repaired the chronometer and one of the aneroid barometers, which had been broken by the motion of one of the pack-horses.

At 11.0 passed to the south of an extensive grassy plain trending to the north-west; at 12.30 p.m. halted to ease the horses' backs from their loads, and resumed our route at 1.40, and at 2.0 crossed a ridge of stony country which the aneroid showed to be about 1700 feet above the sea level, and was the highest spot yet visited by the Expedition.

The country was now so nearly level that scarcely any rise or fall was discoverable, though the aneroid showed some slight undulations; at 1.15 p.m. halted for an hour, and at 6.0 camped in a patch of green grass, which enabled the horses to feed though they had no water.

After it commenced raining the aneroid fell 0.10, but rose again before it ceased.

The aneroid barometer was completely put out of adjustment by the principal lever having been moved from its position by a violent shake in crossing one of the deep gullies.

The country was so level, although we were crossing the watershed between the north-west coast and the Gulf of Carpentaria, that the aneroid only varied from 29.55 to 29.62, and even of this change the greater part was caused by alteration of the temperature.

The metallic barometer has a second time suddenly deviated from the aneroid barometer, and the form of the vacuum vessel has visibly altered, the construction being too slight to bear the motion of the pack-horse, though one of the steadiest animals had been selected to carry the instruments, and they are always surrounded with blankets.

The soil was sandy with acacia scrub, paper-bark gum, stringybark, and bloodwood; at 10.0 the country became stony, with white-gum, tall acacia, and triodia, and we gradually ascended till the aneroid indicated an elevation of 1100 feet, and we appeared to be on a ridge parallel to the tableland of the interior and at a greater elevation; at 1.20 p.m. observed a clump of melaleuca in a deep rocky ravine, and steered south to it.

At 6.45 a.m. steered south-east and soon ascended a rocky range of altered sandstone and trap or basalt, thinly wooded with white-gum, tall acacia, and grevillia, triodia, and treraphis superseding the grass; at 7.30 the aneroid indicated the greatest altitude (1300 feet) which we had attained since leaving the Victoria River.

2 Aneroid Barometers : 7/0/0.

The instruments employed were an eight-inch sextant, box-sextant, prismatic compasses, pocket compasses, double axis compass, aneroid barometers, thermometers, and artificial horizon, etc.

(Also English Feet, and of Readings of Aneroid Meteor.

A course is easily found by using an aneroid, or it may also be worked off the Ordnance Map.

We descended 2500 feet, measured by my aneroid, to the flat, where the monks made us most welcome.