COLLECTIONS ILLUSTRATING PHYSICAL MINERALOGY 



Arranged to illustrate pp. 145 to 191 of Dana's "Text 

 Book of Mineralogy" 



Complete Collection illustrating Physical Mineralogy : 



Ph. Mln. 1 : 220 specimens, averaging 2)4 x 2)4 Inches, in improved trays.. $110.00 



I. COLLECTIONS ILLUSTRATING COHESION AND ELASTICITY. 



Cleavage and Parting: 



Ph. Mln. 2 : 20 specimens, averaging 2)4 x 2% inch.es, in improved trays. . . $10.00 

 Fracture : 



Ph. Mln. 3: 6 specimens, averaging 2)4 s - X A inches, in improved trays — 1.50 

 Hardness : 



Ph. Mln. 4 : 9 specimens, averaging 2)4 x 2% inches, and a 81.00 diamond, 



in improved trays 3.00 



Ph. Mln. 5: 9 specimens, each in tray 1 x 1 inch, all in oak box 1.00 



Small diamond, 75 cents extra. 



Ph. Mln. 6: 9 specimens, each in tray 1)4 x 1% inches, all in oak box 1.25 



Small diamonds, 75 cents extra; larger diamonds SI. 50 to 

 $5.00 each. 

 Tenacity : 



Ph. Mln. 7: 5 specimens, averaging 2% x 2% inches, in improved trays 1.00 



II. COLLECTION ILLUSTRATING SPECIFIC GRAVITY. 

 Ph. Mln. 8: 25 specimens, averaging 2% x 2% inches, in improved trays.. . $20.00 



III. COLLECTIONS ILLUSTRATING GENERAL OPTICAL 

 CHARACTERS OF MINERALS. 

 Diaphaneity : 



Ph. Mln. 9: 5 specimens, averaging 2)4 x 2% inches, in improved trays $1.50 



Color : 



Ph. Mln. 10: 72 specimens, averaging 2% x 2)4 inches, in improved trays .. 35.00 

 Luster : 



Ph. Mln. 11: 16 specimens, averaging 2)4 x 2)4 inches, in improved trays. .. 7.50 

 Miscellaneous Characters Depending Upon Light, including Play of Colors, Change of 



Colors, Opalescence, Iridescence. Tarnish, Asterism, Schillerization, Fluorescence, 



Phosphorescence : 



Ph. Mln. 12: 16 specimens, averaging 2)4 x 2)4 inches, in improved trays . . $15.00 



IV. COLLECTIONS ILLUSTRATING CHARACTERS DEPENDING 



UPON HEAT. 



Fusibility : 



Ph. Mln. 13 : 6 specimens, averaging 2)4 x 2)4 inches, in improved trays. . . . $ 1.50 

 Ph. Min. 14: 6 specimens, each in tray 1)4 x 1)4 inches, in oak box 1.25 



V. COLLECTION ILLUSTRATING CHARACTERS DEPENDING 



UPON ELECTRICITY AND MAGNETISM. 



Ph. Mln. IS: 17 specimens, averaging 2)4 x 2% inches, in improved trays. .. $12.50 



VI. COLLECTION ILLUSTRATING TASTE, ODOR AND FEEL. 

 Ph. Mln. 16: 20 specimens, averaging 2% x 2)4 inches, in improved trays. .. $8.00 



WARD'S NATURAL SCIENCE ESTABLISHMENT 



DEPARTMENT OF MINERALOGY AND PETROGRAPHY 



George Letchworth English, Manager 



84-102 College Avenue, Rochester, New York 



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