300 
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. 
C. C. C. (Northampton),—We can- 
not undertake to do more in the way 
of testing objectives than we are doing. 
J. A. R. (Wilts).—We shall be very 
happy to tell you which of the two 
glasses are the best, subject to the con- 
ditions of our Verification Department. 
W. L. W. E. (Hants).—Can you 
send us more of the fungi ina pill-box; 
they get so dry, dirty, and smashed up 
in a letter. 
F, E.—Cells received with caps for 
them. They are very good. 
W. P. C. (London).—We do not 
think it is very likely we shall reprint 
No. 1 unless a sufficient number of sub- 
scribers are got beforehand. 
A. A. (Windsor).—One of the con- 
ditions of our Verification Department 
is that all measurements shall be in- 
serted in the Journal. 
T. P. S. (Facit).—Thanks for the 
No. 1; they are always acceptable now. 
J. G. (Northampton).—We shall be 
glad to hear from you upon the subjects 
you mention. 
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, but in this case all replies 
must be accompanied with a penny stamp 
for each letter to cover postage, 
ANIMAL PARASITES.—Have a large 
number of these in exchange for animal 
parasites, ixodes and acari, mounted or 
unmounted. W. A. Hyslop, 22, 
Palmerston-place, Edinburgh. 
EXCHANGE.—Wanted to exchange 
for a good microscope, my collection of 
carboniferous, &c., fossils. List on 
application to George Ward, 10, Friar- 
lane, Leicester. 
GENERAL SLIDES in exchange for 
others. C. D., Care of Editor. 
SALE COLUMN FOR APPARATUS, 
BOOKS, Ere. 
Advertisements in this column are inserted 
at the rate 4d, for each 12 words or portions 
of twelve. 
Advertisers may adopt a nom-de-plume 
under care of the Editor, but in this case all 
replies must be accompanied by a penny 
stamp for each letter, to cover postage. 
All Advertisements intended for insertion 
in this column must reach us before the 14th 
of each month, 
MICRO-SPECTROSCOPE by Browning, 
scarcely ever used. Quite equal to new, 
in Mahogany case, cost £9, price £7, 
or should be glad of offers. A. L., 
Care of Editor. 
For ExcHANGE.—A good one- 
fifteenth immersion objective by Dan- 
cer for sale or exchange. Wanted (1) 
Heliostat, (2) Swift’s best lamp and 
goniometer eye-piece, (3) Ramsden’s 
eye-piece Screw micrometer, or what 
offers. Address J., Care of Editor. 
Microscope for sale or exchange. 
A good binocular microscope by 
Browning, nearly as good as new, in 
mahogany cabinet with box for appar- 
atus. It has mechanical stage; stop to 
ditto to use Maltwood’s finder; a pair 
of A eye-pieces; a pair of B and a sin- 
gle D, Selenite stage; Morris’ rotating 
stage; Achromatic condenser, Polaris- 
cope, Camera Lucida and Bulls’-eye 
condenser. Price £14, or would ex- 
change for a wide angle one-sixteenth, 
by Powell and Lealand, or a set of the 
Quarterly Journal of Microscopical 
Science. B., Care of Editor. 
PotyzoA.—Named slides of British 
and Foreign Polyzoa at six shillings 
and eight shillings per dozen respec- 
tively. J.C. E., Care of the Editor. 
