. Marvels of insect life [microform] : a popular account of structure and habit. Insects; Insectes. Spinners of Silk. AnotluT simplr, but liiKlily usi'ful .xamplf âf the spinnitiR powur is i.\liibit(n of a silken pad into «hich the terminal hooks of the chr\salis become attached and of a girdle around what we may term the waist of the chrvsalis. The fliiicl silk IS prixluced by two larf;e glands, one on ea,h side of the body, whose ducts mute and are continued .â .\ternally as the spinneret, which is a point on the middle line of the lip. differently developed in the different families and sp
. Marvels of insect life [microform] : a popular account of structure and habit. Insects; Insectes. Spinners of Silk. AnotluT simplr, but liiKlily usi'ful .xamplf âf the spinnitiR powur is i.\liibit(n of a silken pad into «hich the terminal hooks of the chr\salis become attached and of a girdle around what we may term the waist of the chrvsalis. The fliiicl silk IS prixluced by two larf;e glands, one on ea,h side of the body, whose ducts mute and are continued .â .\ternally as the spinneret, which is a point on the middle line of the lip. differently developed in the different families and species The dands are of simple structure and vary in size according to the amount of silk- required by the species. In some of the moth-caterpillars that elaborate cocoons their length and weight are considerable : the silkworm, for instance possessing a pair of silk-glands each measuring five times the full length of the body. This length is exceeded by some other sjiecies, the caterpillar of the imlyphemtis silk-moth,' for example, ha\ing silk-glands seven times the length uf Its bodv. In those that do not spin cocoons, on the other hand, the silk-glands. The Demoiselle Uragon-Fly. ^ ' nl;t,M^ !^fl'i?.'^L'""°T*u"'^,.'''^'"''^^"J^'''' dragon-tiirs by reason of thHr dark purple colour. The cylindrical body i^ ui-lallic n-aectiom. Tht pholograph ,ho»s the characteristic rcallng allilude ol this species. 'i'uiaricai oooj ii ^ Telea Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Step, Edward, 1855-1931. Toronto : W. Briggs
Size: 1906px × 1311px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1915
