Si quis fuerit sollicitus consuetudinaliter, mobilis, instabilis, audax, iracundus, calidum cerebrum videtur talis habere, e converso se habens frigiditatem praetendit. Si vero fuerit piger, obliviosus, somnolentus, humidum nimis designat.

Translation
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The following vocabulary might be useful:

consuetudinaliter:  (adv.) customarily
talis:  of such a kind
praetendit:  praetendo:  usually means to stretch forth or extend; translate here as "seems to be"
piger:  lazy
obliviosus:  forgetful
somnolentus:  drowsy
nimis: too much