. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. 347 Fig. 846. Spinning spool of Epeira diademata pyriform gland. X 188. FlQ. 847. Longitudinal section of a spool of the aggregate gland. X 188. Fig. 348. Spinning spool of the glandula aciniformis. X 188. Fiti. 819. Longitudinal section of a spool of the ampullate gland. X 188. FiG. .160. Longitudinal sec- tion of spool of glandula tubuliforrais. X 188. (After Apstein.) FiG. 351. An aciniform gland. X 30. Fig. 352. A pyriform
. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. 347 Fig. 846. Spinning spool of Epeira diademata pyriform gland. X 188. FlQ. 847. Longitudinal section of a spool of the aggregate gland. X 188. Fig. 348. Spinning spool of the glandula aciniformis. X 188. Fiti. 819. Longitudinal section of a spool of the ampullate gland. X 188. FiG. .160. Longitudinal sec- tion of spool of glandula tubuliforrais. X 188. (After Apstein.) FiG. 351. An aciniform gland. X 30. Fig. 352. A pyriform gland. X 105. Fig. 853. Longitudinal section of pyriform gland. X lOB. FiG. 854. The spinning glands of Epeira diademata in natural site. X 9. (After Apstein.) ac, aciniform glands; p, pyriform glands; am, ampullatc glands; ag, aggregate glands; t, tubeformcd or tubular glands (glandulffi tubuliforines.) Note B.—Secretion ov Viscid Beads. Dr. Apstein is inclined to think that the foundation thread is created from the "Aciniform ; As soon as the foundation is stretched the spools of the Glandultc Aggregatai (the Aggregate or Treeform Gland,s) are pressed on it, and leave on it a little drop of viscid secretion. The three spools stand close together on the superior spinneret—tliat is to say, their mouths lay close together. If now tlie two superior spinnerets be pressed to the foundation thread, the six spools of the two sorts will embrace it,. 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 McCook, Henry C. (Henry Christopher), 1837-1911. [Philadelphia] The Author, Academy of Natural Science of Philadelphia
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
