642 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



a strip moistened with acetate of lead. If arsenic be present, 

 the silver paper soon darkens. The lead paper is simply in- 

 tended to indicate the presence of sulphnreted hydrogen. 

 The treatment with the permanganate is absolutely necessary, 

 otherwise a blackening of the silver paper and a slight brown- 

 ing of the lead paper will invariably take place, though per- 

 haps only after some time, even in the absence of arsenic. 

 14 (7, 1873, ccvii., 511. 



giraed's pkepakation of the peotoxide of ieon. 



Dr. Girard, of Paris, has presented to the consideration of 

 the Academy of Sciences a preparation of the protoxide of 

 iron, which he recommends to the Academy as possessing 

 the tonic properties of the salts of iron, and as not j^roducing 

 constipation, but, on the contrary, having a slightly purga- 

 tive action. 3 B, May 22, 1873, 139. 



GOUBLER ox PEOPYLAMINE. 



Professor Goubler docs not agree entirely with those who 

 recommend propylamine as a valuable specific in articular 

 rheumatism, remarking that this, as well as methylamine and 

 their combinations, act much like ammonia and ammoniacal 

 salts, constituting diffusible and fluidifying stimulants. On 

 this account he thinks them capable of rendering good serv- 

 ice in cold rheumatism (or that in Avhich there is little fever), 

 and especially when there is a tendency to interstitial exuda- 

 tion and a thickening of the fibro-synovial tissues, but that 

 they are very apt to exasperate rather than alleviate the in- 

 flammatory and febrile phenomena of intense acute articular 

 rheumatism. 18 A^ July 4, 1873, 40. 



AETIFICIAL FIBEINE FEOM THE "WHITE OF EGG. 



Dr. John Goodman, in a series of articles in the London 

 journals, warmly commends what he calls artificial fibrine as 

 a very nutritious substance, capable of being administered 

 to invalids under circumstances where other food is not ac- 

 ceptable. It is formed by emptying the albumen or white 

 of the Q^^^ into cold water, and allowing it to remain there 

 for twelve or more hours. In this time it undergoes a chem- 

 ical molecular change, becoming solid and insoluble, assum- 

 ing an opaque and snowy white appearance. This and the 



