n^ Experimental Enquiry Into the 



Thefe fubftances were boiled together fo as to form a foap, and, after cafting into frames, 

 afforded lywt. iqrs. of foap. According to the returns mentioned in a former part of the 

 communication, the tallow and rofm alone fhould have afforded iicwt. fo that the fifti ap. 

 pears only to add Icwt. It might be fuppofed that this 2cwt. aqrs. of filhy matter had combined 

 with the tallow and allcali, forming part of the foap: it was otherwife, the greater part was of 

 a black colour, and adhered to ths under part of the foap, immediately above the wafte leys. 



Thefe materials afforded i^cwt. ^qrs. ^Ib. of foap : of this the tallow and rofm gives <)cwt. 

 and the fiflj ^wt. The greater part of the fifhy matter was ufelefs, being nearly in a gela- 

 tinous ftate. 



Obfervatlon. 



la the art of hard foap making, it is known, that the addition of fea-falt, or weak kelp ley, 

 is neceffary, to enable the foapy compound to feparate and rife to the top of the wafle ley. 

 If we attempt to follow this practice with the combination of fifh and tallow, inftantly the 

 filhy matter feparates, and the tallow rifes to the top in the form of light yellowilh coloured 

 foap. This fadl fhows us the impoffibility of combining fifli and tallow to make bard foap. 



Scft Soap made from Fijh, Tallnv, i^c. 



Experiment I. 



lb. ez. 

 Herrings - - _ - 36 O 



Tallow - - - - 4 II 



Rofm - - - - 2 5,5 



Palm-oil _ - - - I *| 



This gave 45/^. of foap of the coafiftence of treacle. Accordii^ to calculation, the tallow, 

 rofin,and palm-oil gives i8lb. i2o%. and the fifh I'jW. The foap in this ftate is too foft for 

 the market, fo ihat it requires to be deprived of a portion of its moifture to reduce it to the 

 ftate of common foft foap, when it weighs only 33/i. It was found a difficult operation to 

 cffedl an union of the fifh and tallow, as it required, not only a longer continuance of boiling, 

 but alfo a greater proportion of alkali, than a fimple combination of tallow and rofin. Even 

 after careful boiling, if the alkali contained the fmalleft portion of fea-falt, the fifh feparated- 

 from the tallow : this is a circumftance of fuch a nature, as to render working in the great way 

 Tery precarious. 



Many other experiments of the fame nature with the one now mentioned, are related in the 

 report ; but it will be fufBciently fatisfadtory, to give the following table-of expences, which is 

 iiVNn up upon an average of all the trials. 



Expencs 



