22 MANURE S. 5. 



therefore, it is highly probable, that the 

 fallible matter of this marl is a pure, or near- 

 ly a pure, cnlctirecus earth -^f. 



We may therefore venture to fet down, as 

 the component parts of one hundred grains, 

 of this n:iarl, which may be taken as a fair 

 fpecimen of the \A.hite marls of thisDiftri^, 

 8 J grahij of chalk, 

 10 grains of fand, 

 5 grains of ciay. 



2. The Clay-Marl of Hemsby. 



In its mitural Jlate, it is fituarcd in extcn- 

 five bedsor jams of confiderable depth (feeMiN-- 

 106). Its colour, when dry, fomewhat lighter 

 than that of fuller's earth, flightly tinged with 

 j'pecks of a yellowifh- brown colour : its ccn- 

 texture that of a gi'itty fuller's earth, inter- 

 fpcrfed with granules of white chalk. 



•f The lime has a perceptible, but very i^aXni, yelloxvijh 

 t'nt. By the addition of a tindure of galls the ulti- 

 rnate filtered liquor becomes turbid : a Kvh:t' mucilnre 

 fjbfides ; leaviiig a tranfparent ^r<r3 liquor. A tliicftjre 

 of g'alls added lo the lime-water, before the addi'.ion of 

 the acid, has a fjmewhat fim.llar e;!"ei5l. But, prerious 

 tJ the calcination, tlnfture of galls produces no change 

 whatever upon this marl, eiilKr in a diluted or a dlflbh'ed 

 frate. 



