This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1838 Excerpt: ...eggs, the hatch and become silk worms. A great number of persons raise worms of that kind. They are the worms of the fifth class, called Ai-tsan, or cherished silk worms Care must be taken that the water surrounding the vase be of the height of the eggs it contains; for, if the exterior water be raised above the line ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1838 Excerpt: ...eggs, the hatch and become silk worms. A great number of persons raise worms of that kind. They are the worms of the fifth class, called Ai-tsan, or cherished silk worms Care must be taken that the water surrounding the vase be of the height of the eggs it contains; for, if the exterior water be raised above the line of the eggs, they will die, or not be hatched. If the exterior water be lower than the eggs, then they will not feel the cool air, and their hatching will not be delayed. If their hatching be not prevented, they cannot be preserved from three to seven days in the vase. If they cannot be kept from three to seven days in the vessel, when they hatch, they will fail to accomplish their task, that is to say: they will attempt, in vain, to spin their cocoon. When the. moths have come forth, and the females have laid their eggs, they cannot hatch at the end of seven days; these eggs will not hatch until the following year; but they must be deposited under the shade of a bushy tree. Some persons put them in unbaked earthen vessels. They hatch in from three to seven days, and the worms which proceed from them succeed in forming a good cocoon. Thirteen varieties of silk worm are now distinguished: 1st. The silk worms which have three moultings, and only hatch once; 2d. The silk worms which have four moultings, and hatch twice; that is to say: those whose eggs produce a second crop in the same year; 3d. The silk worms with white heads; 4th. The silk worms called Hie-chi-tsan; 5th. The silk worms of the country of Thsou. (Thsou is the ancient name of the present province of Houkouang.) 6th. The black silk worms; among them, some hatch once, others twice. (See 2d;) 7th. Ash colored silk worms; 8th. The silk worms hatched from an Autumn moth; 9th. The silk w...
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