. Elementary biology, animal and human. Biology. 20 ANIMAL BIOLOGY housekeeper, while usually based on the wrong inference that they are actually engaged in eating her woolens, is, nevertheless, a most valuable proceeding, because it checks, in so much, the multi- plication of the species which is the sole duty of the adult insect. " There is no easy method of preventing the damage done by clothes moths, and to maintain the integrity of woolens or other materials which they are likely to attack demands constant vigi- lance, with frequent inspection and treatment. In general, they are Uabl
. Elementary biology, animal and human. Biology. 20 ANIMAL BIOLOGY housekeeper, while usually based on the wrong inference that they are actually engaged in eating her woolens, is, nevertheless, a most valuable proceeding, because it checks, in so much, the multi- plication of the species which is the sole duty of the adult insect. " There is no easy method of preventing the damage done by clothes moths, and to maintain the integrity of woolens or other materials which they are likely to attack demands constant vigi- lance, with frequent inspection and treatment. In general, they are Uable to "affect injuriously only articles which are put away and left undisturbed for some little time. . Agitation, such as beating and shaking, or brushing, and exposure to air and sunlight, are old remedies and stiU among the best at command. Various repel- lants, such as tobacco, cam- phor, naphthalene cones or balls, and cedar chips or sprigs, have a certain value if the garments are not already stocked with eggs or larvae. . Furs and such garments may be stored in boxes or trunks which have been lined with the heavy tar paper used in buildings. New papering should be given to such receptacles every year or ; '. Fig. 15. — Life history of clothes moth. (U. S. Dept. of Agriculture.) 19. Silkworms. — One species of moth, the silkworm (Fig. 16), is of great economic importance to man. The larva of this insect feeds upon the leaves of the mulberry tree, and after reaching matm:- ity it spins a cocoon, requiring about three days for its completion. The silk is obtained by heating the cocoon in ovens to kill the pupa, and then by reeling off the silk and spinning it into threads. " For many hundreds of years the cultivation of the silkworm was con- fined to Asiatic countries. It seems to have been an industry in 1 Circular No. 36, Second Series, United States Department of Please note that these images are extracted from scanned page images that
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