—— 
January 1, 1914] 
NATURE ’ 
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MINERALOGY —CRYSTALLOGRAPHY— 
PETROGRAPHY—GEOLOGY. 
Ask for our new 
GENERAL CATALOGUE XVIII. 
(2nd Edition) 
for the use of Middle and High Schools and Universities. 
Part I, 260 pages, 110 Illustrations. 
This catalogue has been prepared with the view of making an exhaustive 
compilation of all educational appliances for the teaching 
of Mineralogy and Geology from a scientific as well as from 
a practical p int of view. All the subjects are treated typically, and 
instructive specimens have been selected with the greatest care. A close 
examination of the catalogue will show, that owing to its careful compo- 
sition it gives the opportunity of procuring the most complete outfit for the 
various schools for instruction in and the study of the subjects named, 
Catalogue No. 18, Part I, will be sent free on application. 
Part II will appear within the course of the year. 
(Collections and single specimens of Minerals and Fossils, 
Meteorites bought and exchanged.) 
Dr. F. KRANTZ, 
RHENISH MINERAL OFFICE, BONN-ON-RHINE, GERMANY. 
Established 1833. Established 1833. 
ROCK SECTIONS FOR THE MICROSCOPE 
New List of over 600 well cut Rock and Mineral 
Sections now ready, post free from 
JAMES R. GREGORY & CO., 
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1389 FULHAM ROAD, SOUTH KENSINGTON, S.W. 
Telephone: 2841 Western. 
Telegrams: ‘‘ Meteorites, London.” 
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Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphzrium, 
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other specimens of Pond Life. Price 1s. per Tube, Post Free. Helix 
pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes, 
THOMAS BOLTON, 
25 BALSALL HEATH ROAD, BIRMINGHAM. 
MARINE BIOLOGICAL ASSOCIATION 
OF THE UNITED KINGDOM. 
THE LABORATORY, PLYMOUTH. 
The following animals can always be supplied, either living 
or preserved by the best methods :— 
Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryopbyllia, Alcy- 
onium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus, 
Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus, 
Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone, 
Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus, 
Salpa (preserved), Scyllium, Raia, &c., &c. 
For prices and more detailed lists apply to 
Biological Laboratory, Plymoutt. 
THE DIRECTOR 
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