Reaction of the Blood of Infants. 



323 



which the bell is suspended by a wire passing over a grooved wheel 

 and continuous with a length of steel measuring- tape, which in 

 turn suspends the counterweight. 



The appliance consists of a large and a small grooved wheel 

 mounted on a single axle; from the small wheel a silk thread sus- 

 pends a double magnet fitted with a hinged iron armature, which, 

 on magnetization, firmly grasps the measuring tape of the gasom- 

 eter. From the large wheel is suspended a counterweight which 

 outbalances the magnet, permitting the weight to sink to the 

 bottom of its guiding channel. 



The tube leading to the gasometer carries an expiratory flutter 

 valve; from the subject's side of this valve, a short take-off leads to 

 a large tambour which operates a riding-arm, making and break- 

 ing a current during expiration and inspiration respectively. 



At the beginning of expiration, this contract is made a frac- 

 tion of a second before the gasometer bell begins to move ; a relay 

 closes the current which operates the magnet, causing it to firmly 

 grasp the steel tape and ride with it during its full excursion. 

 At the beginning of inspiration, the tambour breaks the circuit, 

 the magnet releases the tape, and the counterweight drops to its 

 original position. The counterweight carries a pen which re- 

 cords its movements on a revolving drum. 



150 (1897) 



Observations on the reaction of the blood of infants with acute 

 intestinal intoxication with the phosphotungstate reagent. 



By JEROME L. KOHN. 



[From the Pathological Laboratory, Department of Physiological 

 Chemistry, Mt. Sinai Hospital, New York City.] 



In a previous paper 1 on chemical examinations of the blood 

 in cases of infants and children with acute toxic gastro-intestinal 

 symptoms (cholera infantum), it was noted that in some an in- 

 tense blue color was obtained using only the phosphotungstic 

 reagent after the uric acid had been precipitated with silver lac- 

 tate. This blue color was often six to eight times more intense 



1 Schwarz, H., and Kohn, J. L, Am. J. Dis. Chil., 1921, xxi, 471. 



