352 SCIENTIFIC NOTES. 



yield 10 to 22 per cent, more oil than by the old processes ; besides, the oil 

 is purer, and entirely free from glutinous matters, and requires no purifica- 

 tion ; besides, the oil contains more stearin and margarin, and consequently 

 yields a harder and a better soap. The mode of operating is very simple. 

 The fatty matters and the sulphide are mixed together in a closed vessel, 

 and after digestion the sulphide is allowed to filter off, carrying with it the 

 oil. The receiver is then converted into a distilling apparatus ; steam is 

 introduced ; the sulphide passes off and leaves the pure oil behind. The 

 sulphide may be used as often as required. 



Lime and Egg Cement is frequently made by moistening the edges to 

 be united with white of egg, dusting on some lime from a piece of muslin, 

 and bringing the edges into contact. A much better mode is to slack some 

 freshly-burned lime with a small quantity of boiling water ; this occasions 

 it to fall into a very fine, dry powder, if excess of water has not been 

 added. The white of egg used should be intimately and thoroughly mixed, 

 by beating, with an equal bulk of water, and the slacked lime added to 

 the mixture, so as to form a thin paste, which should be used speedily, as 

 it soon sets. This is a valuable cement, possessed of great strength, and 

 capable of withstanding boiling water. Cements made with lime and 

 blood, scraped cheese, or curd, may be regarded as inferior varieties of it. 

 Cracked vessels of earthenware and glass may often be usefully, though 

 not ornamentally, repaired by white lead spread on strips of calico, and 

 secured with bands of twine. But, in point of strength, all ordinary 

 cements yield the palm to Jeffrey's Patent Marine Glue, a compound of 

 India-rubber, shell-lac, and coal-tar naphtha. Small quantities can be pur- 

 chased at most of the tool-warehouses, at cheaper rates than it can be 

 made. When applied to china and glass, the substances should be cau- 

 tiously made hot enough to melt the glue, which should be then rubbed on 

 the edges, so as to become fluid, and the parts brought into contact 

 immediately. When well applied to the stem of a common tobacco-pipe it 

 will break at any other part, in preference to the junction. The colour of 

 the glue prevents its being used for china. 



