THIRD METHOD OF MAKING EYES. 123 



again until all the parts are smooth, and the glass has diffused 

 itself over the whole iris. The eye is now placed on some 

 warm cinders, and left to cool slowly, without which precau- 

 tion it is liable to break ; or it may be put into warm water, 

 and allowed to cool gradually. It is then removed from the 

 wire by loosening" the latter. This method is only adapted for 

 eyes of a middling* size. 



THIRD METHOD OF MAKING EYES. 



There is still another method of making 1 eyes, which is per- 

 haps better than those we have already described ; and that is, 

 to blow them if we possibly can ; which, however, cannot be 

 done when they are small. In this operation, a pipe of baked 

 earth is used, or a tube of glass six or seven inches in length, 

 at the end of which a little white enamel is placed. This is 

 placed to the flame, so that it may be blown. This enamel 

 forms a globe, whose dimensions depend upon the quantity of 

 air introduced. When this globe is of the size wished, we 

 place in the middle, and perpendicularly to the point of the 

 pipe, the quantity of enamel necessary to form the enamel. 

 The second enamel is then incorporated with the first, by 

 presenting 1 it to the flame, while attention is paid to turn the 

 pipe gradually' round, so that the enamel may diffuse itself 

 equally, and the iris be exactly circular. If it is required that 

 this iris should be of various colours, like that of man for ex- 

 ample, small filaments of enamel are distributed in diverging 

 rays of the suitable colour ; the eye is then placed in the flame, 

 until these have incorporated with the iris, after which the pupil 

 is placed as before directed, and the glass applied as before 

 directed. 



During this operation, the globe is almost certain of sink- 

 ing down, partly from the air escaping, partly from the heat, 

 and from the pressure which is used in applying the differ- 

 ent substances : air must again be supplied from time to time 

 to prevent it from losing its form. This becomes particularly 

 necessary when glass is applied, and when it is extended over 

 the whole surface of the iris. 



The eye having got its form and size, the pipe is taken away. 

 To effect this, after the air has been introduced, the entrance 



L2 



