a bird has keen eyesight that no other animal has.
a bird has keen eyesight that no other animal has.
what does a bird have that no other animal has?
keen eyesight
in 1837 bird took part in an investigation of the dangers posed by the arsenic content of cheap candles. these were stearin candles with white arsenic added, which made them burn more brightly than ordinary candles. the combination of cheapness and brightness made them popular. the investigation was conducted by the westminster medical society, a student society of westminster hospital, and was led by john snow, later to become famous for his public health investigations. snow had previously investigated arsenic poisoning when he and several fellow students were taken badly ill after he introduced a new process for preserving cadavers at the suggestion of lecturer hunter lane. the new process involved injecting arsenic into the blood vessels of the corpse. snow found that the arsenic became airborne as a result of chemical reactions with the decomposing corpse, and this was how it was ingested. bird's part in the candle investigation was to analyse the arsenic content of the candles, which he found to have recently been greatly increased by the manufacturers. bird also confirmed by experiment that the arsenic became airborne when the candles were burnt. the investigators exposed various species of animal and bird to the candles in controlled conditions. the animals all survived, but the birds died. bird investigated the bird deaths and analysed the bodies, finding small amounts of arsenic. no arsenic was found on the feathers, however, indicating that poisoning was not caused by breathing airborne arsenic, since arsenic in the air would be expected to adhere to the feathers. however, bird found that large amounts of arsenic were in the birds' drinking water, indicating that this was the route taken by the poison.
golding bird
the mishnah (following ) taught that a sin-offering of a bird preceded a burnt-offering of a bird; and the priest also dedicated them in that order. rabbi eliezer taught that wherever an offerer (because of poverty) substituted for an animal sin-offering the offering of two birds (one of which was for a sin-offering and the other for a burnt-offering), the priest sacrificed the bird sin-offering before the bird burnt-offering (as instructs). but in the case of a woman after childbirth discussed in (where a poor new mother could substitute for an animal "burnt"-offering two birds, one for a sin-offering and the other for a burnt-offering), the bird "burnt"-offering took precedence over the bird sin-offering. wherever the offering came on account of sin, the sin-offering took precedence. but here (in the case of a woman after childbirth, where the sin-offering was not on account of sin) the burnt-offering took precedence. and wherever both birds came instead of one animal sin-offering, the sin-offering took precedence. but here (in the case of a woman after childbirth) they did not both come on account of a sin-offering (for in poverty she substituted a bird burnt-offering for an animal burnt-offering, as required her to bring a bird sin-offering in any case), the burnt-offering took precedence. (the gemara asked whether this contradicted the mishnah, which taught that a bird sin-offering took precedence over an animal burnt-offering, whereas here she brought the animal burnt-offering before the bird sin-offering.) rava taught that merely accorded the bird burnt-offering precedence in the mentioning. (thus, some read rava to teach that lets the reader "read" first about the burnt-offering, but in fact the priest sacrificed the sin-offering first. others read rava to teach that one first "dedicated" the animal or bird for the burnt-offering and then dedicated the bird for the sin-offering, but in fact the priest sacrificed the sin-offering first.)
vayikra (parsha)