wide-bore glass tubing. We heat this in the blow- pipe flame until it becomes very plastic ; then making a sharp outward turn with the right wrist, bend the tube round through a right angle, giving it the proper flattened conformation : and then draw out into a long flat capillary stem (fig. 8, A). We cut this through at the point where it begins to lose its flattened conformation : and so leave attached to
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Method of making emigration tubes. A, method of giving the flattened conformation to the capillary stem ; B, method of bending the tube round to form an elbow.
the next segment a sufficient length of tube to take hold of when we go to work upon it. When a sufficient number of lengths of flattened stem have been provided, we cut these up into segments of about 8 cm. in length ; arrange them side by side after the manner of a palisade ; and then with our