The time between the entrance of the infective principle into the body of the animal and the appearance of the first symptoms is relatively very long, Averaging, according to German investigators, from 20 to 30 days.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The bed and banks of this river were of very uniform extent throughout; Averaging, in width about 100 feet; in height of banks from 30 to 50 feet.
"Journal of an Expedition into the Interior of Tropical Australia In Search of a Route from Sydney to the Gulf of Carpentaria (1848) by Lt. Col. Sir Thomas Livingstone Mitchell Kt. D.C.L. (1792-1855) Surveyor-General of New South Wales"
Thomas Mitchell
That the undertaking need be on a large scale may be judged from the fact that they may have to deal with three or four thousand salmon at a time, as the produce of one night's take, and these salmon Averaging twenty-five pounds in weight.
"Two Years in Oregon"
Wallis Nash