32 CHEMISTRT. 



No. 



712 Fig. 508, blowpipe with ball to unscrew, - $ 1.50 



713 Black's blowpipe, - - 0.50 



714 Fig. 509, crucibles of refractory fire clay, per 



nest, ..... 6 cts. to 0.38 



715 Crucibles with covers, each, - 25 cts. to 1.00 



716 Fig. 510, crucibles of porcelain, with or with- 



out covers, - 20 cts. to 0.50 



717 Fig. 511, spirit lamps, in glass, with cap, - 0.75 



718 Spirit lamps, in brass, - - $1 to 2.00 



719 Fig. 512, mortar and pestle, in porcelain, 50c. to 1.50 



720 Mortar and pestle, in glass, - - 50c. to 1.00 



721 Fig. 513, spatulas, best steel, - - 0.38 



722 Fig. 514, retort stands with heavy iron foot, 



rod eighteen or twenty inches long, and 



two rings with thumb screws, - 1.25 



723 Fig. 515, ditto, with three rings, - 1.50 



724 Ditto, with large rectangular base, two rods, 



and four rings, ... 2.50 



725 Ditto, with two rods and six rings, - - 300 



726 Fig. 515, ditto, with brass foot, rod, and 



rings, - - $2 to 4.50 



727 Fig. 516, Cooper's lamp furnace, - - 2.00 



728 Fig. 517, Knight's assay lamp, - - 5.00 



729 Fig. 518, Knight's chemical furnace, - $8 to 12.00 



730 Fig. 519, furnace of fire clay, with iron 



hoops, $4.50 to 7.00 



731 Fig. 520, Black's chemical furnace, - - 15.00 



732 Fig. 521, tongs for chemical purposes, $1 to 2.00 



733 Fig. 522, pneumatic trough or cistern, of ja- 



panned tin, with fixed and movable shelf, 

 fourteen inches long, ten inches wide, and 



ten inches deep, - ... 2.00 



734 Fig. 522, ditto, larger, sixteen and a half 



inches long, twelve wide, and twelve deep, 2.50 



735 Mercury troughs, from - - - $3 to 8.00 



736 Fig. 523, Cooper's mercurial tube, 37 cts. to 0.75 



737 Fig. 524, brass stop-cocks witli double male 



screws, - 0.75 



738 Fig. 524, connectors, or union joints, - - 0.25 



739 Connectors, with jet, 0.38 



740 Connector, with bladder gas bag, 0.38 



741 Connector, with pipe for gas bubbles, - 0.38 



