

100 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. A.—Several correspondents, with 
yourself, have enquired when the Journal 
is to be permanently enlarged, to which 
we answer, when our list of subscribers 
is enlarged also. The new year has not 
increased the names upon our books to 
an appreciable extent. 
C. C_—We are trying what can be 
done to provide a series of articles upon 
Mosses, but there are many things in 
the way which prevent us making a 
hurried start. 
E. R. T.—If you send your objec- 
tives in to the Verification department, 
the fee is payable for each measure- 
ment of aperture. If measured at both 
extremes of the collar adjustment, they 
will be reckoned as two objectives. 
You can set the index at any number 
you think fit, and if we measure at that 
point, it will be charged as an ordinary 
non-adjustable objective. 
M. H. S.—Notice of meeting 
crowded out of this month’s number. 
C. L. C.—For continuation of list 
of objects shown at Soiree see next 
number. 

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 Hditor, but in this case all replies 
must be accompanied with a penny stamp 
for each letter to cover postage, 
PARASITE OF COD-FISH.— Will send 
this splendid object for other first-class 
slides.—Rev. J. Horn, 75, Castle-road, 
Scarbro’, 
AIR PUMP.—A good air pump of 
small pattern, in exchange for a good 
2" objective, Wray’s first series prefer- 
red.—G., care of Editor. 
NOTICE. 
With a view to increasing the eff- 
ciency of this department, we have 
decided to publish only the names and 
addresses of those who have general 
lists to select from. Intending ex- 
changers need therefore merely send an 
application by post card, “‘ Please insert 
my name and address in your list for 
general exchanges.” Will our readers 
assist us in making this department 
more useful ? 

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. 
WANTED, a good preparation of one 
of the larger Diatomaceae in conjuga- 
tion, for which £5 will be gladly paid. 
Address, L. D., care of the EDITOR. 
Microscopic SLIDES. —A small 
but well mounted collection to be dis- 
posed of. Address, ‘‘ Micro.,’’ care of 
the Editor of the Worthern Microscopist. 
WANTED, for cash, first-class micros- 
copic section of HETERANGIUM, or 
material. A.S.G., 50, Lowden Road, 
Herne Hill, London, 


