424 baker's north YORKSHIRE. 
Opticians in the microscope helped the workers to dissect 
the plants and get a better knowledge of their structures. 
The minute floral organs were made known and shown to 
have important characters, and the cell structure of stem, 
leaves, &c., were also carefully investigated, and thus the 
structural characters of the entire plant assisted much in 
grouping these minute plants into a natural arrangement. 
In 1855, "The Bryologia Britannica" was issued by W. 
Wilson, of Warrington, in which a good many additional 
mosses were made to the British Flora. Mr. Wilson had 
for long been a correspondent of Schimper, and in his book 
called attention to the " Bpyologia EuPOpoea," and intro- 
duced into his work much of the arrangement of the classi- 
fication of that work. The book under the above title was 
issued as a third edition of Hooker and Taylor's Muscologia 
Britannica." In it are described about 450 mosses then 
known in Britain. 
Berkeley's "Handbook of British Mosses" was pub- 
lished in 1863, and followed the classification of the Bryologia 
Britannica. Some 75 additional species are added in this work. 
A useful synopsis of British Mosses was issued by Charles 
P. Hobkirk of Huddersfield in 1873, a second edition 
in 1884. In this was enumerated a total of 576 mosses then 
known in Britain, and it was a useful book to students. 
During the time that the classical work, the Bryologia 
Etiropcea'' was issuing, 1836 to 1855, the authors had several 
British ccrrespondents, many of whom would render aid in 
discriminating the British mosses, the localities of which are 
given in that work. 
The most eminent of these for Yorkshire was certainly my 
early master, Richard Spruce, who then resided at Welburn, 
near Castle Howard, and I had the good fortune to become 
one of his pupils. From him I got to know how to use a 
microscope, and thus got my first knowledge of the beauties 
of the mosses, and I can truly say their examination and 
