138 THE MICROSCOPICAL NEWS. 
T. Hornschuchiana, Hornschuch’s screw Moss, is found fruiting 
in April and May on walls and rocks, also on banks in marly soil, 
and is frequently confounded with TZ: vevoluta, growing on lime- 
stone walls, from the revolute margins of its leaves, but the leaves 
are more spreading and more evidently recurved, ovato-lanceolate, 
acuminate, nerve thinner and more excurrent; capsule longer 
with a narrow annulus. 
Frequent on walls, but very rarely in fruit, is Z: vnealis, the 
soft-tufted Screw Moss. Leaves recurved, ovate-lanceolate, with 
plain margins in the upper half; capsules ovate-oblong, erect with 
an annulus ; peristome short, pale and almost white, with a broad 
basilar membrane. 
( Zo be continued. ) 
ADDRESS TO THE MEMBERS OF THE ROYAL 
MICROSCOPICAL SOCIEGY 
By Proressor P. Martin Duncan, F.R.S. 
( Abstracted from the Journal of the Society.) 
VERY Fellow of this Society who has attended the evening 
meetings during the last twelve months must have been struck 
with the very practical nature of our proceedings, and that the 
observations made, and the apparatus exhibited and described on 
those occasions, indicated a growing desire for the perfection of 
the Microscope. At the same time it must have been evident 
that the application of the instrument to its proper purposes is 
open to many sources of error, and that there is an amount of 
intelligence and knowledge required in the management of the 
Microscope, which is the result of much labour, thought, and 
experience. Common sense might tell everybody this, but it 
sometimes happens that when a man has invested a certain num- 
ber of guineas in an instrument he imagines he is correspondingly 
endowed with the abilities of a microscopist in the true sense of 
the term. On the other hand a very large number of able men 
become possessed of instruments humble in appearance and not 
costly in any sense, and they rest satisfied that a Microscope is a 
Microscope, and believe, therefore, that they see the true 
invariably. One of the benefits of belonging to our Society is the 
opportunity of seeing objects properly shown by the .ablest 
manipulators, and of hearing communications on the imperfections. 
and corrections of the instrument, and it would be well if our list, 
