Important discovery in tropical medicine: Metamorphosis of Filaria Loa.

Leiper discovered diurnal periodicity in Filaria Loa, as the worm embryos are found in the blood only during day, as an adaptation to the day-biting habits of their insect vector, a biting fly of the genus Chrysopa. This discovery was published in a single paragraph written by the editor of JAMA.  Digital facsimile from Google Books at this link.

(Thanks to Juan Weiss for this reference and its interpretation.)