Archive image from page 270 of American spiders and their spinning. 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 CUbiodiversity1121211-9742 Year: 1889 ( EFFECTS AND USES OF SPIDER POISON. 271 II. From the indications of anatomy we turn to the testimony of natural- ists and other observers of the effects of sjiider venom. First in order of value, for their extent and thoroughness, are the experiments of Mr. Black- wall,' an abstract of which I present. The experi- menter induced a fe
Archive image from page 270 of American spiders and their spinning. 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 CUbiodiversity1121211-9742 Year: 1889 ( EFFECTS AND USES OF SPIDER POISON. 271 II. From the indications of anatomy we turn to the testimony of natural- ists and other observers of the effects of sjiider venom. First in order of value, for their extent and thoroughness, are the experiments of Mr. Black- wall,' an abstract of which I present. The experi- menter induced a female Epeira diademata to bite him on the inside of the left hand, near the base Evidence ofEflfects. of the fore finger. It continued to force its Fig. 246. The poiaon gland, duct, and fang of Neme- sia cementaria. (After Blanchard.) fangs deeper into the flesh, during a period of many seconds, and at last quitted its hold volunta- rily, when a little blood issued from the wound. Though the spider was in a state of great excitement from pre- vious irritation, Mr. Blackwall did not experience more inconvenience from its bite than from a puncture made near it at the same time with a fine needle. The ef- fects of both injuries appeared to be very similar. Again, a highly exasperated female Diademata was allowed to seize him on the inner side of the left fore arm near the carpus. It continued for more than a minute to bury its fangs deeper into the flesh, Eflrect of gjj qjj quitting voluntarily, a little blood flowed from the wound- gP ed part, near M'hich a puncture was made simultaneously with a fine needle. The effects of this and the preceding experiment were alike. In both cases the air was sultry and the temperature as high as seventy-five degrees. These two wounds were inflicted in the month of July. In the latter part of August, a powerful and much irritated female Epeira quadrata bit Mr. Blackwall on the inner side of the left fore arm near the carpus. It retained its h
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