148 
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. 
R. G.—The errors in your paper 
were the fault of the printer. We have 
called attention to the matter in our 
“Notes and Queries.” 
J. C. C.—We shall be glad to re- 
ceive communications relating to mi- 
croscopical matters from any of our 
subscribers. 
D. B., R. H., J. C.—Distance from 
London, and other causes, may delay 
for a day or so the delivery of ‘‘ The 
Northern Microscopist”; but you 
should receive it by the 3rd inst. 
H. H.—Your letter shall be inserted 
in our next. It was too late for in- 
sertion in this number. See notice as 
to date. 
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, 
CHALLENGER DEEP-SEA SOUND- 
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 
THE NORTHERN MICROSCOPIST. 
this diatom on receipt of stamped 
address with sealed quill or tube. 
PHOTO-MICROGRAPHS.—A_photo- 
graph, much enlarged, in exchange for 
a well-mounted slide of insect prepara- 
tions. Photographs about 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, Etc, 
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 % 
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. 
OxpjecTIve.—A fifteenth, by Dancer, 
170° angular aperaturé, 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. 
—X., care of the Editor. 
OxsjECTIVES.—A half-inch, also a 
one inch object glass, by Dancer of 
Manchester. What offer, cash?—J., 
care of Editor. 
Arr Pump.—A four-inch air pump, 
by Collins, without receiver. Offers 
requested. B. D., care of Editor of 
NORTHERN MICROSCOPIST. 
