xxxviii Sir William Jackson Hooker. 
largely to its value. He co-operated in the publication of 
many papers on exotic mosses in my father’s ‘Journals of 
Botany,’ and edited a greatly enlarged edition of the ‘ Musco- 
logia Britannica ’ under the title of 6 Bryologia Britannica.’ 
In 1828 my father first became acquainted with the 
Rev. M. J. Berkeley, of Kings Cliffe, Northamptonshire, the 
mycologist, who was then, I believe, on his way to visit 
Captain Carmichael in Appin. This led to a very intimate 
friendship, and repeated visits to West Park and Kew. 
Mr. Berkeley took the same interest in the Fungi of the 
herbarium as Mr. Wilson did in the Musci, and but for him 
this order of plants would never have attained its present 
pre-eminence ; for his zeal induced my father to urge his 
correspondents in all parts of the world to collect fungi ; with 
what success is shown by the richness of his herbarium, and the 
numerous papers on exotic genera and species of the order 
published by Mr. Berkeley in the botanical Journals, in the 
‘Transactions of the Linnean Society,’ and many other 
works. Mr. Berkeley also contributed the volume on fungi 
to the third edition of Hooker’s ‘ British Flora ’ (vol. v, p. ii 
of Smith’s ‘ English Flora ’), and, dying in 1889, he bequeathed 
his herbarium to Kew, together with the choice of his botanical 
library. 
In 1830 Mr. Hewett Cottrell Watson, the most accom- 
plished of British botanists, then resident in Edinburgh, 
requested permission to accompany the students of the 
botanical course on an excursion to the Breadalbane Moun- 
tains, for the purpose of ascertaining the altitudes affected by 
their plants. Thus commenced a very active and interesting 
correspondence between my father and this acute botanist, 
which led to the publication of many papers in the Journals 
conducted by the former, to the botanical expedition of the 
latter to the Azores, and indirectly to his valuable account 
of the Flora of that interesting archipelago 1 in Godman’s 
‘Natural History of the Azores’ (London, 1870). 
In 1831 Mr. W. H. Harvey, of Limerick (afterwards Pro- 
1 London Journal of Botany, vols. ii, iii, and vi. 
