British medical journal . every(itop of his swiftmechanical marchand in every pauseof his resolute ob-Hcrvation there is oneand the same perfectexpression of perfectegotism, perfect in-dependence and self-confidence and con-viction of the worldhaving been madefor flies. Youi- flyfree in the air, fi-eeiu the chamber, ablack incarnation ofcaprice, wandering,investigating, fleet-ing, flitting, feastingat his will with richvariety of feast, fromthe heaped sweetsin the grocers win-dow to those of thebutchers back yardand from the galledplace on your horsesneck to the brownspot on the roadfrom which
British medical journal . every(itop of his swiftmechanical marchand in every pauseof his resolute ob-Hcrvation there is oneand the same perfectexpression of perfectegotism, perfect in-dependence and self-confidence and con-viction of the worldhaving been madefor flies. Youi- flyfree in the air, fi-eeiu the chamber, ablack incarnation ofcaprice, wandering,investigating, fleet-ing, flitting, feastingat his will with richvariety of feast, fromthe heaped sweetsin the grocers win-dow to those of thebutchers back yardand from the galledplace on your horsesneck to the brownspot on the roadfrom which, as tliehoof disturbs him,he rises with angryrepublican buzz ;what freedom is likehis-? The house-fly isall that Kuskiu de-scribes it to bo, butit is more. It is themost cosmopolitanof insects. AVher-cver man is there isthe fly. It is found From GreenlandsicV mountainsTo Indias it is naturally more ftequent in warm climates than iucold, as the rate of its development depends very largelyupon Fig Unlike the lice and the bed-bug, the fly, like the flea,passes through a complete metamorphosis. It will breedin almost any rotten matter, whether vegetable or animal,and it breeds most successfully, as Gordon Hewitt haspointed out, when certain processes of fermentation aretaking place. Probably the fermentation has a favourableeffect upon the food of their larvae. Undoubtedly theplace most readily selected by the female for laying hereggs is stable manure. A few years ago there was aremarkable reduction in the number of house-flics inLondon, and Lord Montague of Beaulieu attributed thisreduction to the refreshing and antiseptic petrol which the streets were then bathed. I do not knowwhat experiments Lord Montague had made on the sub-ject of the insecticidal value of petrol vapour, but theordinary man in the street attributed—and I think morecorrectly—the diminution of the plague of flies to theabsence of the nidus in which the female fly
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmedicine, bookyear185
