In fact, between the years 1300 and 1600, no fewer than 1400 men of distinction can be enumerated from Germany alone who travelled to the Holy Land (Rohricht and Meissner, Deutsche Pilgerreisen, pp. 465-546).
The process was developed by Madame Lefebre in 1859; by Meissner in 1863, who found that moist gases gave a better result; and by Prim in 1882, who sparked the gases under pressure; it was also used by Lord Rayleigh in his isolation of argon.