40 Method of whitening Gray Marine Salt 



elfc than the exterior fide of the firft row of cells, as the illuf- 

 trious Malphigi fuppofed. The pith in all plants is com- 

 posed of hexagonal cells. In herbaceous plants, and parti- 

 cularly thofe which are highly fucculent, thefe cells are 

 often filled with juices more or lefs thick or coloured. In 

 ligneous plants, naturally drier, they are, on the other hand, 

 almofi: entirely empty, and tranfparent. The cellular tiflTue 

 in bulbous roots is pulpy and fucculent; in the cotyledons it 

 is hard and brittle; and in the albumen and feeds it is dry 

 and arid. The parenehyme of the leaves, of the bracleai, fti- 

 pulue, and calyces, is formed by cells filled with a juice almofi: 

 always coloured, and green. The rich corolla?, which di- 

 fplay to the light the elegance of their forms and the fplen- 

 tlour of their colours, but of which the beauty and frefimefs 

 -vanifh in a moment, are not fo thin as the delicate mem- 

 branes of the cellular tifiue : the juices which fwell the 

 tranfparent utriculi of which they are formed give them 

 thefe colours ; the one fometimes diffufed into the other by 

 imperceptible tints, fometimes abruptly oppofed, and height- 

 ening their fplendour by the contrail. Here the cellular tifiue 

 is fo delicate, that the mVhteit. touch is fufficient to alter and 

 tarnifli it: the leaft prefiure reduces it to mucilage, and it 

 appears to be the momentaneous product of the air and 

 •water. This tifiue is obferved alfo in the (lamina and the 

 piftils. The pollen, that fine dull which contains the fubtile 

 fluid necefTary for fecundation, appears to be only an accu- 

 mulation of fmall bags formed of the cellular tifiue : in a 

 word, it is this tifiue which, by dilating itfelf, produces fuc- 

 culent fruits. 



The cells are proportionally more abundant in herbs than 

 in trees, and in young flioots than in old timber. The embryo 

 is compofed almofi entirely of cellular tifiue. The medullary 

 radii, which extend from the centre to the circumference in 

 the trunks and branches of trees with two cotyledons, are 

 fometimes alfo nothing but a thin membrane of cells. - 

 I l o be continued.] 



IX. Method of whitening the Gray Marine Salt to fit it 

 for domejlic Purpofs hijhintaneoujly, and without the Aid 

 of Heat. By Pajot Deschakmes*. 



g 



RAY or unrefined marine fait, as every body knows, is 

 covered with a tilm earthy cruit which alters more or lefs its 

 whitenefs; and it is a matter of fame confequence, both in 

 * From the fame. 



regard 



