. R. FRIEDLANDER & SOHN, 
Par BERLIN N.W., CARLSTRASSE 11. 
Natural History and Natural Science Booksellers. Established since 182%. 
Largest stock of the whole Literature of Natural History and the Exact Sciences. 
Apply for classified catalogue in 25 parts, (each one Patan on department of a 
Seience), aa e 10 ¢, each,—Just published: Part XXI: ralogy and Crystal-— aa 
lography, 38 pp., containing about 1,500 works.—Part <XxIV eae Chaasiesty, SE 
Pp., containing about 1,000 works. ba ae 
jan.— It, ane = Sire 
Van Nostrand’s Engineering M gazil 
COMMENCED JANUARY, 1869. 
