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20 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. 


W. L. W. E. (Hants).—The fungi 
we have duly received and have for- 
warded them to an expert in such 
matters. 
Cy An 1. (Stattord).—$V ow are ‘cor 
rect, the alga is Plocamium coccineum 
and you will see that after so long a 
period the color is well retained. The 
excrescences upon the oak leaf are not 
fungi. They are commonly called oak 
spangles, are really galls, each contain- 
ing a single insect which retains its 
habitation till March. 
J. A. C. (Hants).—We cannot test 
or verify oculars under any condition, 
at least at present. 
A. A. (Windsor).—We have asked 
for a batch of objectives (3ths) to be 
sent us for selection; but they have not 
yet come to hand. 
C. A. G. (London).—It is a mistake 
for you to assume that high powers are 
unnecessary for botanical work. 
D. D. (London).—We did expect to 
get railed at for advocating the use of 
wide apertures; we wish however that 
you will keep a copy of your letter and 
reproduce it without alteration in ten 
years time. 
EXCHANGE COLUMN FOR 
SLIDES AND RAW MATERIAL. 

Communications not exceeding 24 words 
are inserted in thiscolumn jree. 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.. Aes IELyslop i228 
Palmerston-place, Edinburgh. 
Cast Skins of larva of Cloéon 
(Ephemeride), well mounted, in ex- 
change for other objects of interest. 
W. Blackburn, Woodlands, Chorlton- 
cum-Hardy. 
GENERAL SLIDES in exchange for 
otherss, 1C.9D:) (Care of Editor. 
SALE COLUMN FOR APPARATUS, 
BOOKS, Erte. 
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 vce 
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-plece 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. 3B., 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. 
ee a  Y 
—_— a 
