"Why?"
"Because after three or four days they should turn to a light slate color if they are the sort of eggs we want. Those that remain yellow are the unfertilized ones and will be of no use to us; we must discard them."
"And do the eggs always remain slate color until hatched?" questioned Pierre.
"No, they next turn to a dull, brownish slate tint and then the caterpillar comes out. The changes may take place more rapidly than this and the entire process require but a day or two. It all depends on the temperature and the light. Josef knows by long experience just what to do to hurry things along."
As Marie and Pierre glanced at the immaculate white shelves that awaited the newcomers, and realized that for the first time the actual care of the work they had so many times idly watched was upon their young shoulders, it seemed like a dream.
"Now there are many pitfalls which we must be careful to avoid," announced Josef. "In the first place we must beware of rats, mice, spiders, ants—even chickens. All of these creatures can work havoc among the caterpillars. Probably you will not need to worry about them very much; certainly not the rats, mice or chickens. Hens and chickens cannot get in here if you are watchful and close the doors. As for the rats and mice, your father has pretty thoroughly exterminated them. Spiders and ants will find little encouragement in a clean place like this, but we must be on the lookout for them, because one never knows when they will creep into a building. The greatest danger, aside from some epidemic spreading and destroying your crop, lies in feeding your silkworms wrongly. Remember, they must have no wet leaves if we want them to live. You know that already, I guess, or you ought to, for you certainly have gathered enough food for them. Moist leaves will make silkworms ill sooner than almost anything else. So never get leaves that are wet with dew or those that have been rained on. When it looks as if a storm was coming pick a sufficient number of leaves in advance and keep them fresh and cool in the cellar."
"The picking does not trouble us so much as the feeding, Josef. We have never done that. How many times must we feed the worms?"
"At the beginning three times a day; and never forget that the young worms must have the youngest and most tender leaves. Later they will need the tougher ones, with more solid food elements in them, but not at first."
"They are pretty fussy, aren't they, Josef?" laughed Marie. "Lots more particular about their food than we are. Mother makes us eat what is set before us, and never allows us to argue as to whether we like it or not; sometimes it isn't what we'd rather have, either."
"But you manage to live and grow fat on it just the same," grinned the old servant. "Now your silkworms wouldn't. They'd die, and that would be the end of them. Of course some varieties are more robust than others; but they all have to have the same care."