In the meantime some of the caterpillars that worked more slowly were still busy with their spinning, and could not be disturbed. Accordingly much care had to be taken in removing the cocoons that were finished. Those in the lower tiers of arches were first taken out, and afterward the ones higher up on the shelves. The sooner the cocoons could be collected, after their completion, Josef said, the better, for within ten days they depreciated from seven to eight per cent., and if sold in bulk, brought a lower price. In consequence the Brettons, who were to sell their crop to a silk merchant who visited the town each year, promptly set about gathering their harvest as soon as possible. Many of the cocoons were really beautiful, being of a perfect oval outline and of pale golden color. Marie and Pierre were delighted. "It is worth all the endless trays of mulberry leaves, isn't it, Mother?" exclaimed Marie. "Why, even Father could raise no finer or larger cocoons, I am sure." "We have done well," her mother agreed. "But remember, we have had great good luck. No epidemic or disease came to blight the lives of our caterpillars; nor did annoyances of any sort interrupt their spinning. We did our part, certainly; but favorable conditions had much to do with our success." "I only hope we have kept the right sort of cocoons for breeding," said Josef. "That is all that is troubling me now. Upon our selection will depend the quality of our next season's crop. There are so many things to think of in choosing cocoons for hatching. Not only must they be as perfect as we can get them, but they must have nicely rounded ends and a fine, strong thread. I tried to search out those with the ring-like band round the centre, for I have heard your father say that if we could get those we would be sure of having vigorous silkworms, since only caterpillars of the most powerful constitution make their houses in that way." "It seems to me we kept out a lot more than we shall need for breeding, Josef," complained Marie. "We always have to put aside more than we actually require, Marie, because many will fail to hatch successfully and will be a loss," explained Josef. "Usually growers plan to devote about a sixth of their crop to this purpose." "A sixth! Why, that would cut down our sales dreadfully!" ejaculated the girl. "Better sell less now and be assured of a plentiful supply of eggs next year," was the dry answer. "Don't you think so?" Therefore the cocoons for hatching were gathered into one place and after the floss that clung to the outside of them had been removed so that it should not entangle the moth when it came forth from its house, Madame Bretton took a needle and being extremely careful not to pierce the chrysalis inside by putting it through the centre of the cocoons she strung them on strings from three to four feet long and hung them over some wires stretched across the top of the room.