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 coo! 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 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, whese 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 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 cvlours, 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, 
antil 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 | 
