CHEMICALS, CHEMICAL APPARATUS, ETC 1 . 



81. Chlorate of Potash and Slack Oxide of Manganese, best 

 quality, by the pound or hundred-weight, at the lowest 

 market rates. Packages with a pound of the former and 

 four ounces of the latter in each (see Manual, p. 172), per 

 dozen 86 00 



32. Zinc, granulated, per pound 20 



Scrap zinc, twisted so as not to mat, Is better, and usu- 

 ally cheaper. Iron filings or nails will answer. 



33. Sulphuric Acid, by the carboy of 160 pounds, boxed for 



shipment as freight (express companies refuse to take it) 7 60 



Smaller quantities can be sent the same way, but gener- 

 ally it is better to get It of a near druggist. It must not 

 be packed with other goods. 



?4. Four 2%-inch Lime Wheels, in patent canister 75 



As soon as an exhibition is over, the lime can be placed 

 in this portable canister, closing air-tight, and so will last 

 for several occasions. 



35. A Sealed Canister of a dozen 2^-inch Lime Wheels 1 75 



36. Sciopticon Tank (see Manual, p. 84, Fig. 26) 100 



37. Tank, with clamps (see Manual, p. 84, Fig. 26) 3 00 



38. Two Pipettes, with rubber bulb and a dozen glass tubes 1 50 



39. Plate Glass, 4^ by 3%, to show crystallization, etc., per doz. 1 50 



40. Glass, quarter plate, B. P.O., per dozen 30 



41. Glass, coated for tracing, per dozen 60 



Scratching clear lines upon a coating of dense blue gives 

 the best effect, and is the easiest to do. Drawing with 

 India ink or carmine upon a clear varnished surface is 

 most in use (see Manual, p. 135). 



Chemicals for tank experiments, colors, mats, etc., for 

 slides, and all lantern appliances not herein enumerated, 

 will be furnished at the lowest market prices. 



SEPARATE PARTS OF APPARATUS OCCASIONALLY 

 CALLED FOR TO SUPPLY DEFICIENCIES. 



42. Sciopticon Objective, corrected for use on the Sciopticon (see 



Manual, p. 30, Fig. 15, a, 6, c, d) 10 00 



43. Objective, for long distances, 10-inch back focus (see Manual, 



p. 164) 12 00 



44. Sciopticon Condenser, mounted, and fitting any of the new 



instruments 12 00 



45. Piano-Convex Condensing Lens, diameter Scinches 3 00 



4 inches - 4 00 



4^ inches ~ 4 50 



4^ inches 6 00 



5 inches 7 50 



