By
comparing the accounts given in old pigeon treatises of carriers and tumblers with these breeds as now existing in Britain, India, and Persia, we can, I think, clearly trace the stages through which they have insensibly passed, and come to differ so greatly from the rock-pigeon.
He said
comparing the Corps' records for the 2018 Easter special patrol with 2017, a total of 5,836 offenders were apprehended in 2018 compared to 7,361 in 2017; a total of 6,551 offences were recorded in 2018 compared to 8,896 in 2017, and a total of 3,085 impounds were made compared to 3,500 in 2017.
Change
comparing to previous year's end 5.41 6.88 6.19
Indirect methods include
comparing times of death of animals exposed to a mosquito bite with those infected parenterally with known doses and
comparing the time between mosquito feeding and development of viremia with the time between needle injection and development of the same viremia level.