Visited by Dr. Richard Bradley, professor of botany at Cambridge
Richard Bradley (1688-1732) Professor of Botany at Cambridge did work in ecology, horticulture, and natural history. A protege of James Petiver, he was elected a fellow of the Royal Society in 1712, so he was 26 when he visited Leeuwenhoek.
F N Egerton, F. N. "Richard Bradley's illicit excursion into medical practice in 1714", Med Hist. 1970 Jan;14(1):53-62. doi: 10.1017/s0025727300015131.
The day Bradley arrived in Holland, 9 May 1714 O.S., he visited Antoni van Leeuwenhoek (1632-1723).18 He must have had a letter of introduction from Petiver, because without one he probably would not have been admitted. Petiver himself had been turned away on 2 August 1711, though Leeuwenhoek later wrote him an apology: ...
Bradley promised to describe Leeuwenhoek's 'rarities' in his next letter, but he later failed to do so.