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On either of side the main room there are two annexes opening out from it; these are reserved chiefly for the younger children, some of whom, I think, are little boys. In the left-hand annex, behind the ladies who are making a mitre, there is a child who has got a cake, and another has some fruit--possibly given them by the Virgin-and a third child is begging for some of it. The light failed so completely here that I was not able to photograph any of these figures. It was a dull September afternoon, and the clouds had settled thick round the chapel, which is never very light, and is nearly 4000 feet above the sea. I waited till such twilight as made it hopeless that more detail could be got--and a queer ghostly place enough it was to wait in--but after giving the plate an exposure of fifty minutes, I saw I could get no more, and desisted.

The rougher the method of assay adopted, the larger should be the quantity of ore taken. If the degree of accuracy attainable with the methods and instruments at the assayer's service is known, it is easy to calculate what quantity should be taken for any particular case. If the results are good within 0.001 gram, then, taking 1 gram of ore we can report within 0.1 per cent., or if they are good within 0.0002 gram, taking 20 grams of ore, we can report within 1 part per 100,000, or very closely within 6-1/2 dwt. to the ton. If it is wished to be yet more particular in reporting, larger quantities must be taken. The difficulty of manipulating very small or very large precipitates, &c., must be borne in mind. So, too, must the fact that the greater the weight of the final product of an assay, the less, as a rule, is the percentage error. The distinction between absolute and percentage error, often overlooked, is important. If 0.5 gram of silver be cupelled with 20 grams of lead, there may be obtained a button of 0.495 gram; the absolute loss is 0.005 gram, and this equals 1 per cent. of the silver present. Similarly, cupelling 0.1 gram, the resulting button may be 0.098; the absolute loss is only 0.002 gram, but this equals 2 per cent. of the silver present. In the same way the student should see that the two results, 91.5 per cent. and 92.0 per cent., are really more concordant than the results 9.1 per cent. and 9.2 per cent.

I struggled up on my feet and proceeded to carry the big vessels to the river bank, where I intended to construct the raft. The effort to take each heavy bottle those few metres seemed almost beyond me in my exhausted state. At last I proceeded to strip the floor of the hut, which had been made with split _assahy_ palms (_Euterpe oleracea_ L.), in order that I might make a frame to which I could fasten the bottles. With a great deal of persuasion I got Filippe and Benedicto to help me. The long pieces of _assahy_ were too heavy for our purpose, and we had the additional trouble of splitting each piece into four. It was most trying work in our worn-out condition. Then we had to go into the forest and collect some small liane, so that we could tie the pieces together, as we had no nails and no rope.

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