V R E F ACE.

This little volume constitutes a further contribu-tion to the Electro-biological series of works whichhave now occupied my attention for a longperiod. They may be said to have been com-menced many years back; and some part of thelabour was even undertaken whilst still a studentof medicine. On attending the Physiological Lec-tures of Professor Mayo, 1 was remarkably struckwith the unsatisfactory account of the functions ofthe brain, and I was surprised that so littleappeared to have been done in connecting mentaloperations with that organ to which they were due.

, I had not only the advantage of studying underthis gentleman of genius, who is so well esteemedfor his knowledge of the nervous system,