130 
Draw-tubes versus Deep Eye-pieces. 
same time the fringes of interference rapidly increase in width, and, 
mingled with details of the image of the object, they only serve to 
mask it. The image produced at a less distance from the objective 
is less affected by these fringes when magnified by a higher ocular, 
and will he found, although enlarged to the same extent, to he more 
sharply or clearly defined, and more exact in all its minute repre- 
sentations of real structure . — The Lens, July. 
