But before attempting to describe it I should say that just as I was beginning to observe the sixth bed, a slight change came in the weather which made two considerable changes, each in a different direction, in my opportunities of observation. It had been quite calm and at the same time cloudy. Now a light breeze began to blow and the sun shone out. The effect of the breeze was, at first, so to increase the motion of the car as to make very close observation impossible. But Signor Davelli presently applied a sort of ballasting machinery, which had the effect of greatly steadying the car. I was so much interested in what was going on below that I did not very accurately observe how this was done. But I think that it was somehow in this way. He moved, by mechanical contrivance, certain weights in the car, so as to change the centre of gravity in such manner as to render the part of it which we occupied subject to less motion than the rest. I have not much skill in such matters and I hardly know if this is possible, but so it seemed to me. But even after this was done the car was not by any means as steady as before. At the same time, however, the sunshine which now appeared disclosed some features of the scene which I should otherwise have missed. For now, at the northern end of the beds, on a platform at right angles with the western platform, I saw several shadows which indicated to my now skilled eyesight the presence of several of the invisible cars. They were standing all still when I first saw them, but presently one moved, rose quickly from the earth, and passed gradually out of sight to the northward. I followed its course with my glass for several minutes, till it was nearly out of sight. I then turned again to the seed-beds. The men at the sixth bed were very few, only five in all, and each was working apparently on his own account. But they were all doing exactly the same kind of work. They were, as I thought, making a final selection of the germs which had undergone so careful a process of cultivation. Each of them had three boxes, instead of one, slung in front of him, and a long instrument in his hand with which he extracted certain substances from the ground. This instrument was constructed so as to hold in a little receptacle what was lifted from the ground. Each of the workers, also, had slung over his shoulder what looked like a small frame. I selected one of the five at random, and watched his proceedings more particularly. Now and then he would unsling the frame and place it on the ground. Then he would give it a little twist, whereupon it would assume a form very like that of a lady’s work-table. I saw him do this many times, and each time he took something out of the closed receptacle which I have just mentioned, and placed it on the table, and observed it carefully with some kind of instrument that might have been a kind of microscope. After a more or less minute observation each time, he placed the substance observed