The house fly : disease carrier an account of its dangerous activities and of the means of destroying it / by L. O. Howard.
- Leland Ossian Howard
- Date:
- 1912
Licence: In copyright
Credit: The house fly : disease carrier an account of its dangerous activities and of the means of destroying it / by L. O. Howard. Source: Wellcome Collection.
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![F., in twelve hours, but at 45° F. they did not hatch until the third day, and then only when placed in a warmer temperature for the purpose of studying them under the microscope. Doctor Hewitt has carefully observed the hatching of the eggs, and this is a process which has now be- come familiar to many Americans through the excel- lent moving-picture exhibitions given under the auspices of the American Civic Association from films prepared in England at the expense of Mr. Daniel Hatch, Jr., Fig. 5.—Egg of house fly; greatly enlarged. (Original.) Chairman of the Fly-fighting Committee of the Asso- ciation. Doctor Hewitt’s description follows; “A minute split appeared at the anterior end of the dorsal side to the outside of one of the ribs [refer- ring to two distinct curved rib-like thickenings along the dorsal side of the egg] ; this split was continued posteriorly and the larva crawled out, the walls of the chorion [the eggshell] collapsing after its emergence. The Larva We have just described how the egg hatches. The young larva as it issues from the egg is a slender](https://iiif.wellcomecollection.org/image/b28050745_0049.jp2/full/800%2C/0/default.jpg)
