450 



CENTEAL SCIENTIFIC CO., CHICAGO, TT. S. A. 



No. 12290. 



No. 12298. 



No. 12302. 



No. 12308. 



FILTERS, Soil, see general heading Filtering Apparatus. 

 FURNACES, Muffle, see general heading Furnaces. 



12290. LIMESTONE TESTER, Hopkins, for determining the purity of limestone. The outfit consists 

 of two glass vessels joined together, one for holding the limestone sample, the other for the 

 charge of acid. The apparatus is light and easily weighed. (See Bulletin No. 194 of the Uni- 

 versity of Illinois Agricultural Experiment Station) $3.50 



For other LIMESTONE TESTERS, see Carbon Dioxide Determination Apparatus. 

 MICROSCOPES, see general heading Microscopes. 

 MILLS, Grinding, see Crushing and Grinding Apparatus. 

 MOISTURE DISHES, see general headings Boxes, Dishes. 



12298. MULCH CYLINDER, McCall's, for determining the effect of mulches upon the rate of evapora- 

 tion from soils. Design as illustrated; of galvanized iron, 19 inches high; approximate diam- 

 eter at top 4 inches; at bottom 8 inches 2.80 



12300. MULCH CYLINDER, McCall's, same as No. 12298, but 29 inches high 3.00 



12302. MULCH CYLINDER, Stevenson & Schaub's, of galvanized iron 11 inches in diameter by 13 inches 



high, with water supply tube 1.60 



NITROGEN DETERMINATION APPARATUS, see general heading Nitrogen Determination 



Apparatus. 



12308. ORGANIC MATTER DETERMINATION APPARATUS, for determination of organic matter 

 in soils by the wet combustion method. Consists of two flasks, two Mohr-Geissler Potash 

 Bulbs, one Peligot Tube, two Winkler 's Spiral Potash Bulbs, Condenser, Dropping Funnel, rub- 

 ber stoppers and connecting tubes. (See Bulletin 24, U. S. Bureau of Soils) 13.50 



10932. POTASH TUBE, Peligot (A) 40 



10938A. POTASH BULB, Winkler's, 100 mm (B) 2.00 



10916. POTASH BULB, Mohr-Geissler (C) 1.50 



5550B. FLASK, Potassium Hydrate, 200 cc (D) 22 



5550C. FLASK, Round Bottom, 300 cc (E) 28 



6160B. FUNNEL. Separatory, 60 cc (F) 1.45 



3224C. CONDENSER, 15 inch (G) 1.40 



