The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . f. Fig. 1.— Bedeguar Gallof Wild Rose. eat their way out while Fig. 2.— a, oak gall produced by Cynips qucrcus-folii;b. section of gall; c, gall-insect (.Cyiiifsquercus-folii). history is as follows: (a) Out of a summer-gallmale and female forms emerge; (&) the femaleslay their fertilized eggs and give origin to winter-galls in so doing; (c) from these winter-gallsthere arise parthenogenetic females which intheir egg-laying produce the summer
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . f. Fig. 1.— Bedeguar Gallof Wild Rose. eat their way out while Fig. 2.— a, oak gall produced by Cynips qucrcus-folii;b. section of gall; c, gall-insect (.Cyiiifsquercus-folii). history is as follows: (a) Out of a summer-gallmale and female forms emerge; (&) the femaleslay their fertilized eggs and give origin to winter-galls in so doing; (c) from these winter-gallsthere arise parthenogenetic females which intheir egg-laying produce the summer-galls fromwhich we started. Galls vary greatly in shape, and may be solidor spongy, and contain one or several cavities,in each of which a larva is lodged. Though gallsare very generally distributed, they occur mcommerce chiefly as Levantine articles of .-Meppo nut-galls are spherical and tubercu-lar ; blue, black, and white varieties are recog-nized, the two former being picked before theescape of the larva, the latter after its exit. Theyare produced by a gall-fly (Cynips galice-tinc-toria) on tw-igs of an oak (Qucrcits infectori
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1908
