A WORKING MICROSCOPE, 215 
If any brother microscopist should have observed them or knows 
anything of them, his observations would no doubt be interesting 
to the readers of this Journal. 
WILLIAM BuRTON. 
We have not the slightest doubt but that the organisms attached 
to the stem in question belong to the group of collared Monads, 
so beautifully illustrated in Part I. of Mr. Saville Kent’s Manual of 
Infusoria (now publishing). Upon plate IV., figs 12 and 13, are 
given illustrations of A/onosiga Steinit found attached to a stalk of 
Vorticella convallaria ; and Salpingeca convallaria on the stem of an 
Epistylis, both amplified 650 diameters, of which we give a rough 
drawing at fig. 43. 
We have not reproduced Mr. Burton’s drawing, as we imagine that 
upon further investigation the two projections noticed were only the 
lateral edges of the extended collar, and finding these observed we 
are surprised that the presence of a central flagellum was not also 
demonstrated. All microscopists interested in these organisms 
should procure Mr. Saville Kent’s work. Mr. Kent concurs with 
this opinion. 
A WORKING MICROSCOPE. 
ae the issuing of a circular previous to going to press with 
our first number, a correspondent enquired whether we could 
see our way to give a series of articles on ‘‘ How to select a 
microscope,” to which we replied in our answers to correspondents. 
Now the selection of a microscope is a moot point with most 
microscopists, but nearly every one who has had much experi- 
ence will perhaps admit the use of a small, yet good instrument 
for general use. For travelling, Society demonstrations and dis- 
secting, a microscope with a short body, but capable of extension 
by means of a long draw-tube, so that it may yield the full amplifi- 
cation of an ordinary instrument, yet capable of being shortened in 
order that the dissector may sit well over it, is a great convenience, 
There are many forms of cheap instruments, and those some- 
what of the pattern shown in fig. 44 may be pronounced the best ; 
the “Economic” of Messrs. R. and J. Beck, the “College” of 
Messrs. Swift and Son, and the “ Histological” of Mr. Collins. 
They are all remarkably steady, being hung on the Jackson model, 
can be used with moderate powers, and all have the Society screw 
for objectives. 
Some operators have asserted in public print that a large and 
expensive stand is not necessary, and that more work has been 
