Chemical Science. 393 



Lynn san/1, 3 of nitre, 3 of soda, and 3 of Cornwall china clay. 

 This mixture is melted into a frit, and is then ground to a fine 

 powder, 3 parts of calcined borax being previously added. 



Some specimens furnished by Mr. Rose, were placed in the 

 hands of Mr. Muss and other artists, to be submitted to ex- 

 periments. When placed in heats much higher than they 

 would be subjected to in the fair course of enamelling, the 

 glaze remained firm and perfectly uniform, without any specks 

 or splits having been produced on its surface; the colours; 

 even the pinks and chrome greens, coming out remarkably well 

 upon it, and none of them chipping off, as is frequently the case 

 with the colours of the French porcelain. Transactions of the 

 Society of Arts, 1820. 



13. On preventing the Ravages of Moths in woollen Cloth. The 

 discovery of an easy and effectual method of preventing the 

 destruction of woollen fabrics and furs by moths, has long been 

 a subject of research, and it still stands, I believe, among the 

 list of premiums in the promises of the Society of Arts. 

 Although the process here in question is" known to many indi- 

 viduals, it is not yet known to the public at large, and your 

 Journal offers the means of diffusing it. 



The discovery, although accidental, is due to the officers of 

 Artillery at Woolwich, employed in the inspection of clothing 

 returned from Spain. It was observed, that in casks where all 

 other woollen substances were totally destroyed, those cloths 

 that had been rendered water-proof by the common well known 

 processes, remain untouched. Attention having thus been 

 excited to this circumstance, other similar mixed packages 

 were examined, and the results were found to be invariable. 



This process has the advantage of being cheap, easy of ap- 

 plication, and permanent ; since the chemical change produced 

 by it in the surface of the woollen fibre, is not liable to be 

 affected by time. If, in the case of military stores, no other 

 good result were to follow the use of the water-proof process, 

 this would be a sufficient reason for its universal adoption. The 

 effect of all the odorous bodies commonly used for this purpose 

 is transitory, as they evaporate in the course of time ; but the 

 aluminous soap which becomes united to the animal fibre in 

 the water-proof process, seems to disgust this destructive larva 

 so as effectually to prevent it, like some dyes, from attempting 

 to devour the wool or other animal hairs, which are its natural 

 food. 



There seems no reason why this process should not be 

 adopted in furs for the same purpose ; since great losses are 

 occasionally sustained by their destruction. It might with 

 equal ease be applied to them ; and as it does not appear to 

 produce any effect on the appearance of the woollen sub- 



