each other as hi allow tin- passage of a constant series of sparks from a 

 Ividimkorii"s coil, are lixed in from of the oriiicc of the tube. This is 

 in order to ignite the oxvgen. which nia\' also he done bv udtach- 

 HIL; tinder round the ontire. and burning it. \\hen tlie wires are 

 arranged about the onl'.ee of the tube, and a series of sparks passes 

 ! i ; wren I IK 'in. 1 1 it MI an in \ ert ed ( because of the lightness of the hydro- 

 uvn i jar full of hydrogen is placed over the gas-conducting tube. 

 \\'hen the jarco\ers the orilice of the gas-conducting tube (and not 

 1 iff ore. as otherwise an explosion mi^ht take place ) the cock of the gaso- 

 meter is opened, and the oxvgen tlows into the hvdro^en and is set liidit 

 t> by the sparks. The tlanie obtained is similar to that formed bv the 

 combustion of hydrogen in oxygen.'-"-' I'Yom this it is evident that tlie 

 tiaine is the localitv where the oxygen combines with the hydrogen, 

 then-fore a tlanie of burning oxygen can be obtained as well as a tlanie 

 of 1 lurninu' hvdrogen. 



If. instead of hvdrogen. anv other combustible gas be taken -for 

 example, ordinary coal gas then the phenomenon of combustion will 

 be exactly the same, onlv a bright llame will be obtained, and the 

 products nf combustion will be different. However, as lighting gas 

 contains a considerable amount of free and combined hydrogen, it will. 

 also form a considerable (juantitv of water in its combustion. 



If hvdrogen be mixed with o.xyuvn in the proportion in which thev 

 form water -i.e., if two volumes of hydrogen be taken for each 

 \olume of OXVLMMI then the mixture will he the same as that obtained 

 bv the decomposition of watt r bv a galvanic 1 current detonating 



| !] nicnl may l.c coinliictcd witlmut tin- \viiv-. if tin- liytlr..Lrrii In- li-lilrd in 

 lir. ,.| :, ryliiul.T. .MM! ,n I in- , : iin,. !ini' tin- rylin.l.T !>! hrmi-'lit <.V<T tin- cud of a 



>|. f 1,-ii in; i.\\-.-n. iiixl tin- i.llu-r with n -a-lit.ld.-r lull nf liyiln^i-n. 



i! : . llh In (| )-, ,_cii i- li-litcil. .iinl a c ...... nut! la nip i: las-. ta|'ci-iii'_ r 



' i . . jilai > 'i ''.< i tin' (-'irk. 'I'lii- liydr.i-i'ii nuil nin^ In Imi-n in-^iiic the 

 . ,|i . . a! ! In |" !!- n! tin 1 n\\ jcn. It I In- ciirrcnl n| d\\;.'t'ii I" 1 lln-n lit 1 ! li\ litt !< 



; ,i . . Tl ;: 

 al . IHI!\ 1 ii- i ni Tea 



I. id Ml li\di'i'ji , id ! 

 and : can ea il\ I < ,r.i\ 



IM tin- in^iitiicifiit siipi'lv nl' u.\\ LTi-ii. the IliiiiH- 



i| I'.ir . \ , I, i I 1 1 1 1 -I in 1 1 1 - . a 1 1 < I ! I U 1 1 f. -a | | ' 'a r> a t 



,\\ i,f i..\\ -i-ii In- a.-_-ain im-n-iiM-il, the llaim- rr- 

 ll.iini- max In- mad.' ;<> a|>|u-ar at one nr the 

 di-i-n-a e nf tile elllTelil nl _ a -, in list In- I>V 



hi-ii Li- slin\\n liu\\ air Imnis in an at nn>>jihere 

 ai ill'- lam _dass is mil nl a -ja- eniiil)Ust ilile 



