164 

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. 


G. P.—We have inserted your query, 
but you should refer to Practical Micros- 
copy for a complete answer to your 
query. 
G. P. Congleton.—Your object is a 
Vorticella, probably Vorticella nebult- 
fera. Any book treating of Micros- 
copic objects will give a description of 
it. Have you read ‘‘ Ponds and 
Ditches,” published by Bogue ? 
J. T.—Fasoldt’s or Rogers’ test 
plates are not nearly so expensive as 
Nobert’s were. Nobert’s plates are 
now very rare. 
T. T. Warwick.—Your organism is 
Paramecium aurelia; it is very common 
where sewage matter is poured into 
streams. 
J. S.—Bacteria are a very difficult 
study, and you certainly cannot expect 
to get reliable results from your ex- 
periments when carried on in the way 
youname. Think the matter over. 
D. H.—A sixteenth objective would 
be very little use in the hands of one 
who has ‘‘ never before used a higher 
power than an inch.” 

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, 
SLIDES OF FUNGUS (Tinea Decal- 
vans) in Human Hair, for other well- 
mounted slides.—Send lists to W. 
Hamilton Reid, Yarm-on-Tees. 
WELL-MOUNTED SLIDES of Patholo- 
gical and Histological specimens, in- 
jected and otherwise, in exchange for 
Insects, Polariscopic or Pathological 
slides. — Frank P. Hudnut, Orange, 
Nig Ue SecA 
A SLIDE of well-cleaned Zfithemia 
turgida offered for any other well- 
mounted object or material.—H. S. 
Woodman, P. O. Box 87, Brooklyn, 
E. D., New York, U.S. A. 
A BEAUTIFUL collection of wild 
seeds of Central Ohio to exchange. 
List furnished on application.—F. O. 
Jacobs, Newark, Ohio, U.S. A. 
WANTED Animal Parasites, Inodes, 
Acari, &c., either mounted or un- 
mounted.—W. A. Hyslop, 22, Pal- 
merston Place, Edinburgh. 

GEN ERAL EXCHANGES. 

Dr. Lewis M. Eastman, 349, Lexing- 
ton Street, Baltimore, var Sa 
A. Norris, Church Lane, Urmston, 
near Manchester. 
R. L. Mestayer, Town Hall, Salford. 
CG. j.. jones;.25, Prmcess_ Street, 
Manchester. 

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. 
—_———. 
Microscopic SLiIpEs. — Asmall 
but well mounted collection to be dis- 
posed of. Address, ‘‘ Micro.,’’ care of 
the Editor of the Northern Microscopist. 
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