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 confidence that his application of mechanical principles would eventually be crowned with success.

It is difficult to describe in words an invention so complicated as the bobbin-net machine. It was, indeed, a mechanical pillow for making lace, imitating in an ingenious manner the motions of the lace-maker's fingers in intersecting or tying the meshes of the lace upon her pillow. On analysing the component parts of a piece of handmade lace, Heathcote was enabled to classify the threads into longitudinal and diagonal. He began his experiments by fixing common pack-threads lengthwise on a sort of frame for the warp, and then passing the weft threads between them by common plyers, delivering them to other plyers on the opposite side; then, after giving them a sideways motion and twist, the threads were repassed back between the next adjoining cords, the meshes being thus tied in the same way as upon pillows by hand. He had then to contrive a mechanism that should accomplish all these nice and delicate movements, and to do this cost him no small amount of mental toil. Long after he said, "The single difficulty of getting the diagonal threads to twist in the allotted space was so great that if it had now to be done, I should probably not attempt its accomplishment." His next step was to provide thin metallic discs, to be used as bobbins for conducting the threads backwards and forwards through the warp. These discs, being arranged in carrier-frames placed on each side of the warp, were moved by suitable machinery so as to conduct the threads from side to side in forming the lace. He eventually succeeded in working out his