In all monographs dealing with aerobiology as a whole, the work of Charles H. Blackley, "Experimental researches on the causes and nature of Catarrhus Aestivus", published in 1873, is one of the most important references. It is generally accepted as the first text giving evidence of airborne pollen as the cause of hay-fever, and his most cited experiment deals with the collection of airborne particles using kites, 150 years after Benjamin Franklin's own experiments on atmospheric electricity. However, Blackley's experiments encompassed the whole spectra of pneumology, allergology and aerobiology.