By H. V. Arnold. 74p. , paper. (1918)

ND0006S

The typescript of the original copy of this book is somewhat faded in places due to its age and unevenness of the original printing.  Although we have done our best to compensate for these flaws, there may be areas of print that are still difficult to read.  We apologize, but feel the importance of this information indicates that it should be reprinted and made available to researchers.