OSWALD WEIQEL, 
Established 1797 
LEIPZIG, Kdnigsstrasse 1. GERMANY, 
BOOKSELLER AND AUCTIONEER, 
Special dealer in works of all branches of 
NATURAL HISTORY AND SCIENCE. 
Very large stock of second-hand books (about 400,000 vols.) 
Classified Catalogue sent free of charge on application. 
New books and Periodicals purchased at reasonable terms. 
NOTIGe. 
Parties having detached Natural Crystals or Minerals 
for sale or exchange, should address 
ALEXANDRE STUER, 
40 Rue des Mathurins, Paris, France. 
Catalogues des cristaux naturels isoleg. 16pp. Prix 25 centimes. 
SEE OTHER ADVERTISEMENTS. 
DR. EDW. C. MANN'S SANITARIUM 
FOR TREATMENT OF 
Diseases of the Nervous System, 
FLATBUSH, BROOKLYN, N. Y. 
Established 1876. 
Receives cases of either sex of nervous and mental diseases, alcoholism 
and opium habit. Especial attention paid to Hydrotherapy, Electrothe- 
rapy, Massage, Muscular Exercise, Dietetics and Intensive Alimentation, 
and to the nutrition of the nerve centres. 
Applications may be made either by mail or personally to Dr. MANN. 
