[3011] “Calefiat.”
[3012] Snow-water is pernicious in a very high degree, being the fruitful source of goitre and cretinism.
[3013] See B. xvii. c. 44, and B. xviii. c. 68.
[3014] This is somewhat similar to what is said of the putrefaction and purification of Thames water, on a voyage.
[3015] “Inutilis alvo duritia faucibusque.” The passage is probably corrupt.
[3016] See B. vi. c. 27.
[3017] Or “mud”—“limus.” All rivers of necessity have it, in a greater or less degree.
[3018] On the contrary, the more the mud and slime, the more numerous the eels.
[3019] “Tænias.”
[3020] Waters, probably, impregnated with mineral alkali. As to the “nitrum” of Pliny, see c. 46 of this Book.