Further Particulars respecting Wiolfs Steam-Engirne. m 



Distilled starch gives pyro-mucous acid and oil 



Inuliue does not afford the slightest trace of oil m this opc- 



'''lod; forms with starch a compound of a very fine blue colour. 

 Inuline ?ives with iode a jjieenish-yellow compound 

 The hyd^ro-chloric acid as well as the alkaline solutions ren- 



der starch p,elatinons. _ . 



The inuline is dissolved without giving jelly. , • ,• ^ 



Conc"ntrated sulphuric acid carbonizes starcb with extrication 



of sulphurous acid. , u • o,.;,1 w'ltVinnt 



Inuline is dissolved in concentrated su.phunc acul_ w tho„t 



any smell of sulphurous acid, and ammonia can precipitate it 



^X^^Slmces, like starch are suseeptiblec.1^^^^ 

 verted into sugar by means of sulpl.unc acid, we cannot assign 

 this as a character inherent in starcn. jjetmn 



As to the property which Dr. Thomson regards as a distrtic- 

 tive cl arac er of sta/ch,-that of forming with gall-nuts an inso- 



ble:ompound,-it does not appear ^l-t it o^ight^ o ^^^ 

 mitted, since Dr. Bostock has made experiments uh.ch con 

 rnflift those of Dr. Thomson. . , , 



"there remains only the property of forming -^^ b.,^^^ 

 insoluble compound which inuline shares Y^^l' f f^f .' ^" J^^ 

 property does not seem of a nature to decide the identity ot 



^' X^ uS^lhink we mav conclude, from what has Wn said, 

 that inulTne is a peculiar substance, that it cannot be con- 

 fonnde 1 w^th any^other known vegetable substance and that 

 it oSt To be clZssed among the immediate materials of vege- 

 tables. __——=—. 



LIV. Some further Parimdars respecting Mr. Wooi^t's 

 Steam-Engiue. 



In our last two numbers we laid before our readers regular Re- 

 ports of the work performed by certaia steam-engines employed 

 on the mines in Cornwall, and which we have continued in ou 

 uresent umber, sho^ving tlie comparative advantage in point 

 S Scon m of 'fuel possessed by Mr. Woolf 's engme over any 

 oth?r use. Some of our readers having expressed a vvi.h to 

 re^madlTcViainted with the arrangement of.the vaWes tc,r he 

 two cylinders in his engines, we have in fig. 1. violate ^ -i MJ" 

 comniete section of the nozles and valves of the engine, o his 



r^&oifnow working on t»- Wl--» f ^^^^ ^J tf 

 Var mines,-those mentioned in the Reports above aUuded^to.^ 



