_Collection No. F4._ 80 specimens, omitting those marked (°), in individual trays (2½ × 1¾) and two cloth-board cases, numbered to correspond with accompanying printed list (no labels) 5.00 _Collection No. F5._ 40 specimens marked (*), mounted as collection F4 2.50 _Collection No. F6._ 100 pupils’ fragments (1 × 1), numbered, in paper bags. (Single collection $1.25.) In lots of 5 or more, each 1.00 _Collection No. F7._ 80 pupils’ fragments (like F6). (Single $1.00.) In lots of 5 or more, each .75 _Collection No. F8._ 40 pupils’ fragments (like F6). (Single 50c.) In lots of 5 or more, each .40 _Collection No. F9._ 25 museum size specimens, illustrating structure, faults, stratification, etc. Mounted and labelled 10.00 _For further information or in ordering, address_ WARD’S NATURAL SCIENCE ESTABLISHMENT 84-102 College Ave., Rochester, N. Y. ------------------------------------------------------------------------ Transcriber’s note: Specimen numbers have been regularised as medium weight. Page 7, ‘LeConte’ changed to ‘Le Conte,’ “By Prof. Joseph Le Conte.” Page 12, ‘contined’ changed to ‘continued,’ “continued exposure to the” Page 28, comma changed to full stop, “associated with beds of coal.” Page 34, ‘or’ changed to upright, “_superficial_ or _aqueous_ agencies” Page 96, all instances of ‘per cent’ changed to ‘per cent.’: “60 per cent.”, “30 per cent.”, “85 per cent.” Page 97, full stop inserted after ‘crust,’ “of the earth’s crust. The name” Page 105, specimen number absent in original. Page 106, ‘green sand’ changed to ‘greensand,’ “greensand, and serpentine” Page 107, ‘magnesion’ changed to ‘magnesian,’ “the entire rock is magnesian,” Page 108, ‘70’ changed to ‘69,’ “classification on page 69” Page 114, full stop inserted after ‘rocks,’ “the stratified rocks. Like” Page 126, full stop inserted after ‘veins,’ “in veins. Those fissures” Page 146, instance of thousands formatted without comma delimiter: “4000 to 5000 feet” Page 188, instance of thousands formatted without comma delimiter: “7000 feet high” End of Project Gutenberg's Common Minerals and Rocks, by William O. Crosby