124 
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. 
G, J. J.—Photo-micrographs re- 
ceived, we have noticed them in 
another column. 
J. B. D.—Your papers came safely 
to hand; we should have been glad to 
see some of your enlargements. 
J. C. C.—Thanks for your letter. 
We intend to do exactly what you 
indicate ; but we have been asked by 
numerous correspondents not to let the 
journal drift into high “ologies,” as 
our correspondents have been pleased 
to describe abstruse work only interest- 
ing to a few deep thinkers. It is possible 
we could get your specimens named 
for you. 
G. C. M.—The lichen sections came 
safely, but they are too thick. It is 
almost impossible in such objects to | 
make out the structure. 
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, 
CHALLENGER DEEP-SEA SoOUND- 
INGS.—Ten well mounted and correctly 
named, in exchange for other good 
slides.—Send list to A., 215, Bordesley 
Green, Birmingham. 
MERIDION CIRCULARE.—Mr. W. 
Swinburne, Yeathouse, Frizington, via 
Carnforth, will gratuitously forward 
this diatom on receipt of stamped 
address with sealed quill or tube. 
THE NORTHERN MICROSCOPIST. 
PHOTO-MICROGRAPHS.—A_photo- 
graph, much enlarged, in exchange for 
a well-mounted slide of insect prepara- 
tions. Photographs aéout carte size of 
the following :—portion of fern stem, 
coal section, leg and foot of blow-fly, 
antennz of ditto, section of deal, etc., 
etc. EDITOR. 
SALE AND EXCHANGE 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, 
MICROSCOPE FOR SALE.—A good 
No. 3 binocular, by Browning, with 4 
inch and ¥/ inch objectives, by the same 
maker, and a pair of A eyepieces. 
Also achromatic condenser polariscope, 
camera lucida, Morris’ stage, Selenite 
stage, and silvered side reflector, the 
whole in mahogany case, with box for 
apparatus, cost £26. What offers for 
this splendid working instrument ?— 
Address, in first instance, to CHEMI- 
cus, care of the Editor, NoRTHERN 
MICROSCOPIST. 
OBJECTIVE.—A fifteenth, by Dancer, 
170° angular aperature, price £8. This 
is a splendid glass, the only reason for 
parting with it being that the owner is 
about purchasing a homogeneous six- 
teenth, and does not want both. A 
splendid glass for working at Bacteria. 
—xX., care of the Editor. 
MIcRoscoPpE STAND.—First class 
microscope (Beck’s Popular) and appa- 
ratus, equal to new, cost £II, price 
46 I0s., bargain; also %in. Beck, cost 
45 15s. 6d., price £3 10s.—M., 28, 
Bartlett’s-buildings, Holborn. 
LICHENS.—The writer of the paper 
in the present number upon this sub- 
ject is prepared to supply fasciculi of 
dried Lichen specimens, mounted and 
named, fifty in each bundle, price 15s. 
Also microscopic slides, illustrative of 
the Lichen thallus and the fruit organs, 
Ios. 6d. per dozen.—His address is 
Victoria Villa, Sunny Hill, Whitehaven. 
