CONDITIONS FAVOTJRINa FEEMENTATION. 



19 



a stopcock, with which even half-minims can be delivered with 

 ease*. 



Having prepared a number of small glass tubes closed at one 

 end and drawn out at the other, I proceed to charge them with 

 measured amounts of liquor potassse. As in the previous experi- 

 ments, the liquor potassae is delivered into a little porcelain pot ; 

 and the open capillary extremity of the glass tube , previously 

 well heated in the flame of a Bunsen's burner, is immersed 

 therein. When no more suitable rest is at hand the little por- 

 celain vessel may be placed in the angle between two bottles, so 

 that the upper end of the heated tube inclines against them, 

 partly for support and partly that it may cool more quickly. 

 In two or three minutes, when the whole of the liquor potassee is 

 forced into the tube, this is to be inverted, and its shoulder, where 



Fig. 4. 



Liquor-potassffi tubes with capsule and stand. 



it begins to narrow (fig. 4,*), is heated in a spirit-lamp flame, so 

 that the tube may be drawn out still more in this situation. 



* This little instrument was made for me by Cetti and Co., of 11 Brooke 

 Street, Holborn, London. 



*2 



