196 THE NORTHERN MICROSCOPIST, 

NOTICES TO CORRESPONDENTS, 
All communications should be ad- 
dressed to the Editor, Mr. George E. 
Davis, Dagmar Villa, Heaton Chapel, 
Stockport ; and matter intended for 
publication must reach us not later than 
the 14th of the month. 
All communications must be accom- 
panied by the name and address of 
the writers, not necessarily for publica- 
_ tion, but as a guarantee of good faith. 
Cheques and money orders to be made 
payable to George E. Davis, the latter 
at the Manchester Chief Office. 

H. S.—Unless you are fairly ac- 
quainted with chemical matters we 
strongly advise you to give up all idea 
of mounting in phosphorus; it is ex- 
ceedingly inflammable, and of but 
limited application. 
D. D.—A half-inch should show the 
markings upon P. formosum, except it 
be of very low angle. Is your method 
of illumination perfect ? 
H. H.—The Verification depart- 
ment is not discontinued; we have 
been too busy to attend to it fully 
during the past two months, and must 
ask a little indulgence. After July we 
must make an alteration in this depart- 
ment. 
C. R. C.—Refer to Practical Micros- 
copy. Cooke’s Handbook would suit 
you we think. 
D. B.—The fungus is Wacrosporium 
chetranthi. 
J. C.—The aperture shutter may be 
had from Mr. Collins to fit the substage 
if you so require it. Take no notice 
of what is said, try it for yourself; we 
will lend you one for trial. Micros- 
copy has often been retarded by the too 
implicit following of ‘ bell-wethers,” 

EXCHANGE COLUMN FOR 
SLIDES AND RAW MATERIAL, 
Communications not exceeding 24 words 
are inserted in thiscolumn free. They must 
reach us before the 14th of each month, 

Exchangers may adopt a nom-de-plume under 
care of the Editor, butin this case all replies 
must be accompanied with a penny stamp 
for each letter to cover postage, 

WANTED. Paraboloid and Parabolic 
Reflector. Exchange splendid teles- 
cope, Photo-camera and ¥f plate lens, 
&c.—R. C, Pilling, Robins Nest, 
Blackburn. 
STARCHES. Will exchange a large 
variety of starches and other slides for 
parasites, geological,or other good slides. 
—J. E. Fawcett, Rawdon, nr. Leeds. 
Eccs OF SHEEP FLUKE in exchange 
for foraminifera or diatoms. —C. E. W., 
31, Darley-street, Bradford, Yorkshire. 
CORRESPONDENTS WANTED in all 
parts of the world to exchange micros- 
copic slides or material. All com- 
munications answered.—F. L. Carter, 
20, Trafalgar-st., Newcastle-on-Tyne. 
SIX DOZEN micro. slides for exchange. 
Send list to John Alex. Ollard,F.R.M.S., 
Ye Hermitage, Forty Hill, Enfield. 
STRAW BRISTLE MOULD will be 
sent on receipt of stamped addressed 
envelope to E, Holmes, 149, Essex- 
road, London. 
WANTED diatomaceous deposits and 
dredgings from all parts of the world. 
Will be glad to hear from correspon- 
dents abroad. —T. E. Doeg, Evesham. 
Woop SECTIONS given in exchange 
for rare starches. Send list to the 
Editor, and, if mounted, state in what 
medium. 
WANTED first-class botanical and 
geological slides, rock and bone sec- 
tions; also double-stained vegetable 
tissues and other good objects. Offered 
in exchange anatomical and pathologi- 
cal preparations, a variety of well- 
mounted and interesting specimens.— 
F. R. Martin, Malvern House, Cleve- 
don. 
FIsH scALEs—forty kinds, seeds forty 
kinds, eighteen kinds of Zoophytes un- 
mounted, in exchange for well-mounted 
slides.—Send lists to B., 36, Windsor- 
terrace, Glasgow, 

