On Ben Nevis in particular, he left a tremendous legacy of high-quality routes; indeed, "of the 30 new routes on Nevis from 1896 to 1921, his name appears on exactly half." These include a solo first ascent of Observatory Ridge (V.Diff.) in June 1901, Observatory Buttress (V.Diff.) solo in June 1902, his outstanding eponymous Arete (Severe) two days later on North-East Buttress with William and Jane Inglis Clark, and the first winter ascent of Green Gully (IV,4) in 1906. The latter ascent, with a Swiss alpinist called Eberhard Phildius, was barely recognised in a later guidebook, as he had not climbed the rocks of the Comb on the left, but had instead followed snow and ice in the gully. Indeed, Raeburn's ascent was completely forgotten by 1937, when J. H. B. Bell made the second winter ascent, thinking it was the first. Of Phildius himself little is known; he was almost certainly present in Fort William to meet up with another SMC member, the Rev. A. E. Robertson, as Phildius was involved in the Youth Christian Movement.