A scheme of classification of books and pamphlets was quickly adopted, only to be remodeled four years later by Dr. Chadwick, ably assisted by Airs. Elizabeth J. Collins, the cataloguer.

Table 1 presents a summary of the most common characteristics used to categorize the different types of pain across the 29 classification schemes reviewed.

Efforts to combine ontogenetic and morphologic features in a single scheme have led to classifications so complex as to be impractical. The explicitly morphological classification by Metcalfe and ...