SCIENTIFIC NEWS. \^ 



11th. To temper this paint whether white or coloured, it 

 is neceflary that the ferum -fhould be frelh and not have under- 

 gone any change, otherwife the paint will be of a bad quality 

 and not durable. 



The prefervation of the ferum, particularly ii> the fumraer, 

 requires much caution, becaufe this fluid has a great tendency 

 to putrefy. It is therefore eflential to keep it in a cool place, 

 and to examine before ufing it, whether it has begun to emit 

 a bad fmell ; for, in that cafe, care mull be taken not to ufe it. 



For the fame reafon the veiTels in which the ferum is kept 

 muft be carefully cleaned, and warned frequently with hot 

 water, to remove the fpoilt portions of this fluid, with which 

 the pores of the vefiels might be impregnated. ! 



M. Carbonell aflferts that this paint is fo durable, that when Very durable. 

 prepared with good materials, it may be ufed to paint the 

 walls of damp houfes, without fear of its coming off; an ad* 

 vantage certainly not pofleflbd by difiemper painting. 



The fame author alfo afferts that he has made many experi- 

 ments with this fame paint, and has obtained fatisfaclory re- 

 mits ; and in all cafes fo conftant, that he doubts not, when 

 it mall be known, that it will be generally adopted. He in- May be ufd in 

 ftances, among other examples, the ufe which is made of it out-door work, 

 at Barcelona, as well in the exterior of buildings as within- 

 fide, and he has always obferved, not only that the fun, the 

 air, moifture or drought, produce no change on it, but alio 

 that it is free from bad fmell ; fo much fo, that places where it 

 has been ufed may be inhabited without danger the very day 

 of its application. 



One might be difpofed, at the firft glance, to believe that It is verydif- 



the new paint propofed by M. Carbonell, is nearly the fame fere , nt trom the 



; t » r -ii i ,- i i r i *&> ^ ■. m 'lk paint, 



with that or milk, detcnbed iome years ago by Cit. Cadet 



Devaux, This latter paint may alfo have fucceeded ; but on 

 reflecting upon the eflential difference which exifts between 

 the ferum of the blood and that of milk, it will foon be per- 

 ceived that if the milk paint is good, that of M. Carbonell mull 

 be better. 



But experience muft decide in this refpecl, and it is to be 

 prefumed that a fnort time will make known which of the two 

 methods deierves the preference. 



The work in which M. Carbonell has given the details re- 

 lative to the preparation and ufe of his paint with ferum, is 



dedicated 



