NOTES AND QUERIES. 151i 
press on this subject which will be illustrated with seventeen helio- 
type plates from his best negatives. 
THE THAMES Mup Banxs.—Dr. H. C. Sorby is busy making a 
microscopical investigation of the deposits in the Thames. His 
report will be looked forward to with interest. 
Mr. Botton’s PoRTFOLIO OF DRawincs.—No. 9 of this series 
was issued in March last. It contains drawings and descriptions 
of— 
Cvella virescens. Anurea curvicornis. 
Pyxicola affints. Leptodora (young stages). 
Stichotricha remex. Ldya furcata. 
Trochosphere of Alcyonidium. Haplobranchus estuarinus. 
Castes umbella. Ammothea fibulifera. 
Cephalosiphon limntas. Water-mite (A¢ax albidus ). 
Melicerta tyro. Water-mite. 
Floscularta regalts. Elver, or young eel. 
We are glad to notice that the drawings are more uniform in size 
than heretofore, and this enables them to be bound in a volume if 
required. 
Co.er’s Stupies.—Since our last notice, the following subjects 
have been issued :— 
No. 42. White Syenite, from Lairg, with plate and description. 
No. 43. Transverse section of the cesophagus of dog, injected 
and stained with logwood. 
No. 44. Transverse section of the stem of Azbes nigrum (Black 
currant). 
No. 45. Transverse section of the cardiac end stomach of dog, 
stained with logwood. 
No. 46. Transverse section of the leaf of Scotch fir. 
No. 47. Section of the stomach of dog, Pyloric end. 
No. 48. Section of Porphyritic Basalt, from the Lion’s Haunch, 
Arthur’s Seat, Edinburgh. 
No. 49. Contains no plate, but notice is given that it will appear 
in No. 51. 
PETROLOGICAL AND PATHOLOGICAL STUDIES.—We beg to remind 
our readers that Mr. Cole’s above studies are announced only to 
appear if 150 subscribers for the former and three hundred for the 
latter, can be found, and therefore we urge every microscopist who 
cares even the slightest for these studies to send in his name at 
once to avoid delay in the publication. We cannot do better in 
this connection than to quote the following from the Journal of the 
Royal Microscopical Society :—‘‘ Microscopists have long lamented 
that it was not possible to obtain a guide to the slides sold, so that 
the points of interest illustrated could be intelligently appreciated. 
