54-6 Errata in Notices qftlie Labours of Continental Chemists. 



cently published speak in favour of none of these opinions. We 

 will here briefly give the conclusions which he has drawn from 

 his experiments, viz. that the extraction of urea, by the various 

 methods in which heat is employed, is not at all, as Persoz 

 supposes, due to the production of this substance under the 

 influence of heat ; that Morin's protochloride of uril is no- 

 thing more than an intimate mixture, or rather a combination 

 of urea with the chloride of ammonium ; that the methods by 

 which Cap and Henry supposed they had extracted lactate of 

 urea give merely mixtures in which urea and lactic acid exist 

 in a free state; that, lastly, urea can be extracted from urine, 

 by means of alcohol nearly pure, without the employment of 

 acids or alkalies, of which it might be believed tliat they de- 

 stroy the natural state of combination of the urea. 



Errata in Messrs. Francis and Croft's Notices of the Results of the Labours 

 of Continental Chemists. 



Dt'ar Sir ■^'' ^^^^^''d Taylor, Esq. 



At your request we furnish you with a list of the errata contained in our 

 abstracts. Most of them are such that every chemist will have been able 

 to detect and correct them immediately, for instance, Aq O instead of AgO, 

 where a silver salt is spoken of; and Ag instead of Aq, where nothing about 

 silver occurs. We are inclined to believe that most of your readers will 

 have had the kindness to regard them as typographical errors, and will not 

 have consideretl their occurrence a fair occasion to make a display of their 

 superior knowledge, as a certain Mr.W.A. M. has done, who informs us that 

 K I should be written without a dot over the K. We shall endeavour to 

 obviate the occurrence of such errata in future : at the same time it must be 

 recollected that the great distance prevents us from having proofs trans- 



