46 Kansas Academy of Science. 



Vereinfacbteii Elementare Analyse, by Max Dennstedt. Der 

 deutsohen Chemischen Gesellschaft, Berichte, vol. 30, page 1590; 

 vol. 38, page 3729; vol. 39, page 1623. Organische Verbindungen, 

 by Carl Meyer, page 117. 



II. morse's method. 



The second method used in the test was what is known as Morse's 

 method. This method was first used by Prof. H. N. Morse of Johns 

 Hopkins University. The original paper on the subject is to be 

 found in the American Chemical Journal, vol. 33, page 4?7. The 

 principal feature of the method is that the forward part of the tube 

 is heated entirely by means of a hot platinum wire spiral on the 

 inside of the tube. 



A tube of hard glass 15 mm, in diameter and 70 cm. long is 

 used. Into one end of the tube is fitted a two-hole rubber stopper. 

 Through one hole in the stopper is put a porcelain or quartz tube 

 250 mm. long and 6 mm. in diameter. The bore of the tube should 

 be just large enough to admit a No. 14 wire loosely. The other 

 hole of the rubber stopper is used for the calcium chloride tube of 

 the absorption apparatus. The quartz tube is allowed to project 

 about 25 mm. outside of the rubber stopper. A piece of No. 14 

 platinum wire about 10-12 cm. long is united to a piece of No. 28 

 or 29 platinum wire about 175 cm. long. The piece of coarse wire 

 is placed inside the tube so that the union of the two wires is 3-4 

 cm. on the inside. Removed from the rubber stopper the fine wire 

 extends through the tube to the inner end, and is then wrapped 

 about the quartz tube in small even loops back to within 3-4 cm. 

 of the rubber stopper. Here union is made with another piece of 

 No. 14 platinum wire which leads through the stopper. A small 

 glass T tube 6 mm. in diameter is joined to the quartz tube by 

 means of a piece of rubber tubing. Through one opening the 

 platinum wire leads, and through the other the stream of oxygen 

 enters. The opening through which the platinum wire leads must 

 be sealed. It is very necessary that the platinum wire does not 

 come into contact with the walls of the combustion tube. In case 

 it does make direct contact it will adhere to the sides of the tube as 

 soon as it is heated. 



Just behind the quartz tube and platinum spiral there is placed 

 a 10-cm. spiral of reduced copper-wire gauze. Back of this reduced 

 copper- wire gauze is a 7-om. spiral of well oxidized copper- wire 

 gauze, and behind this spiral of oxidized copper is the porcelain 

 boat containing the substance to be analyzed. Behind the boat is 

 a small spiral of copper-oxide gauze. The distance between the 



