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at the Manchester Chief Office. 
C. A. L.—The small black spots 
upon the bramble leaf, are composed 
of Phragmidium bulbosum, while the 
ochraceous yellow spots are the Uredo 
spores of the same fungus. We cannot 
discover any fungus upon the oak leaf. 
G. C. C.—The fungus is Stachy- 
botrys atra ; it is not rare in the habitat 
you mention. We have often found 
it upon mildewed cotton goods, and 
therefore should expect to find it upon 
mildewed /27ze7. 
W. W.—We cannot tell you where 
to get a good half-inch cheap. ‘Try 
Wray, Laurel House, Highgate. 
J. C. P.—We cannot undertake to 
send replies by post, though we are 
always anxious to help our readers 7 
these columns, 
B. C. W.—In our next number. 
Thanks for the slides, they are very 
well displayed. 
EXCHANGE COLUMN FOR 
SLIDES AND RAW MATERIAL. 
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are inserted in thiscolumn free. They must 
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PARASITES.—Tick of Dog, Sheep, 
and Horse; one of each sent for a good 
THE NORTHERN MICROSCOPIST. 
mounted slide. Alfred Tozer, Jack- 
son’s Row, Manchester. 
DIATOMS AND CrysTALs,—Will 
exchange these for well-mounted Ana- 
tomical Preparations. A. Smith, The 
Laboratory, Essex Road, London. 
CLusTER Cups.—Freshly collected 
specimens of these micro-fungi from 
the dock, sorrel, pilewort, and nettle, 
in exchange for king-fishers’ eggs, side- 
blown. G. Garrett, 13, Burlington 
Road, Ipswich. 
MossEs.—Wanted to exchange a 
few mosses, hepaticze and lichens. J. 
McAndrew, New Galloway, N.B. 
Diatoms.—Synedra ulna well 
mounted for others. G. H. Bryan, 
Trumpington-road, Cambridge. 
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PoLyzoA.—Named Slides of British 
and Foreign Polyzoa, at six shillings 
and eight shillings per dozen respec- 
tively.—J. C. E., care of the Ep1Tor. 
BINOCULAR MIcROoscoPE.—A good 
Binocular Microscope, mechanical 
stage, with pair of A eyepieces and 
one each B, C, and D, Selenite stage, 
Morris’ stage, Achromatic Condenser, 
Polariscope, Camera Lucida, double 
nose piece, Bull’s eye condenser; in 
Mahogany Cabinet, with 2 and 4 inch 
objective. Price £13. Approval. 
B. D., care of Editor NORTHERN 
MICROSCOPIST. 
IMMERSION OBJECTIVE.—A Splen- 
did one-fifteenth Immersion Objective, 
as good as new. What offers? B., 
care of Editor NORTHERN MIcRos- 
COPIST. 
