A STANDARD BODY-TUBE FOR MICROSCOPES. 219 
roughly toothed point, nerved half-way, margins recurved; cap- 
sules roundish elliptical, drooping ; lid with one oblique beak. 
Anomedon longtfolius, the long-leaved Anomodon, is found on 
Scotch mountains, but it does not fruit in Britain. 
Leskea polycarpa is found at the roots of trees, usually near 
rivers. It fruits in May and June, and has ovate-acuminate leaves, 
strongly nerved almost to apex, margins reflexed; capsules sub-erect, 
sub-cylindrical ; lid conical ; monoicous. 
Myrinia pulvinata, the green-cushioned Leskea, is found in 
similar situations, but is very rare. 
Camptothecium lutescens, the rough-stalked Yellow Feather Moss, 
is found on limestone rocks and sandy banks, especially near the 
sea. Stems about 3 inches, irregularly branched, sometimes pin- 
nate; leaves narrowly lanceolate, tapering to a long point, entire, 
nerved nearly to apex; capsules oblong-arcuate, in rough setze, 
which with its conical-beaked lid readily distinguish it from its 
allies. It fruits in April, as also does C. mz¢ens, the shining Feather 
Moss, an elegant species, but rarely found in fruit. 
Brachythecium campestre, is only recorded for Maresfield, Sussex. 
Another rare record for Sussex is Luryuchium. hians. 
WILLIAM STANLEY. 
A STANDARD BODY-TUBE FOR MICROSCOPES. 
OME time ago a committee was appointed by the Council of 
the Royal Microscopical Society to consider the subject of in- 
troducing a standard size for eyepieces, but the report of that 
committee has never been received with much favour by the 
vendors of microscopes. In fact, while the committee was sitting, 
several opticians declared to us that they would not alter the sizes 
of their tubes whatever conclusions the said committee should 
happen to come to, and therefore it seems that some other mode 
of working is necessary to ensure a standard size being carried out. 
The committee, in its report, advised the adoption of “two 
standard gauges for eyepieces,” “for the No. 1, 1.35 inches, and 
for the No. 2, 0.92 inch external diameter, and that the gauge for 
substages should be 1.5 inches internal diameter.” 
There is no doubt that a very general desire exists amongst 
workers with the microscope to have all the working parts of various 
makers interchangeable without the employment of adapters, and 
specially does this apply to oculars; and we see no other way of 
bringing about a standard gauge than by publishing the diameters 
of all stands now in the market, and advising purchasers to choose 
the largest bore. A small eyepiece will fit a Zavge tube, and can be 
