14 Society for Experimental Biology and Medicine. 



ized rabbit sera, it was found that monkey blood, which is very 

 closely related to human blood, can be distinguished from human 

 blood if the humanized rabbit serum is diluted in the proportion 

 of i-ioo before it is added to the blood to be tested. In this 

 dilution very active humanized rabbit sera fail to cause precipitates 

 in the blood of lower monkeys (baboon, rhesus, and Java), while 

 still causing flocculent precipitates within one to two hours in 

 human blood. 



The serum used by the author in this demonstration was 

 obtained from a chicken which had received five injections each of 

 10 c.c. of human placenta blood. This serum proved to be much 

 more selective than the ordinary humanized rabbit serum. The 

 chicken serum in various dilutions up to i-ioo was added to 

 specimens of human and monkey serum in dilutions also of i-ioo. 

 It produced turbidities in all the specimens of human blood, but 

 failed entirely to affect the monkey blood. Finally, the chicken 

 serum was added in a dilution 1-5 to specimens of both human 

 and monkey blood. In the human blood a milky ring formed 

 instantly at the line of junction of the test serum with the human 

 serum, and a flocculent precipitate formed in fifteen minutes, while 

 in the monkey serum no change whatever could be observed. 



3. "An improved cage for metabolism experiments," with 

 demonstration : WILLIAM J. GlES. 



A cage specially designed for experiments on dogs was shown. 

 The parts are so adjusted as to favor the collection and separation 

 of feces, urine and hair. The improvements consist mainly of 

 mechanical devices suggested by experimental experiences of the 

 past few years in metabolism work, all of which are designed to 

 ensure quantitative accuracy as well as comparative convenience 

 in the collection of excreta. 



4. "Properties of ' Bence-Jones' body,'" with demonstrations: 

 WILLIAM J. GlES. 



Through the kindness of Dr. Meltzer a patient's urine containing 

 this substance had been placed at the author's disposal for chemical 

 study. Some of the results of this examination were presented 

 and various properties of the body demonstrated. Special atten- 

 tion was drawn to a test of Boston's new method of detecting 

 " Bence-Jones' body " in the urine. 



