234 
Proceedings of the Royal Society of Edinburgh. [Sess. 
writing, but as the writing increases in speed the rotation about the wrist 
axis tends to disappear. 
3. In the writing of children the part played by finger movement 
is very variable. In general, hand movement predominates even in 
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the formation of the letters, but this must not be regarded as a 
universal principle. 
II. Grip Pressure Apparatus. 
So far as the writer knows, no one has hitherto attempted to obtain a 
record of the pressure of grip in writing. The problem undoubtedly 
presents considerable difficulties, but is a very interesting one. The 
apparatus shown (fig. 3), which would therefore appear to be the first 
attempt to get such a record, has several more or less obvious defects, but 
