_tyria_ and _allopicia_, the pathology, symptoms and treatment of each
of which are presented with wearisome minuteness and completeness.
A long chapter, entitled "_De infectione post coitum leprosi_,"
discusses the transmission of the disease by means of sexual
intercourse, and suggests the possible confusion of lepra and
syphilis.

The usual catalogue of specific remedies terminates the discussion.

An interesting chapter on small-pox[9] and measles, "_De variolis et
morbillis_," gives us the prevailing ideas relative to these diseases
in England during the thirteenth century. Premising his remarks with a
classification of diseases as follows:

Diseases universal and infectious--like _morphoea_, _serpigo_,
_lepra_, _variolae et morbilli_.

Diseases universal but not infectious.

Diseases infectious but not universal--like _noli me tangere_.

Diseases neither infectious nor universal.

Gilbert classifies _variolae et morbilli_ among the universal and
infectious diseases, and in the species _apostemata_. To this latter
species belong also _ignis Persicus_, _carbunculus_ and _antrax_.

[Footnote 9: It is at least interesting to know that small-pox is said
to have made its first appearance in England in 1241.]