EXPOSITION
THE FOURTH PLAGUE.
It has been noticed that—setting apart the last and most terrible of the plagues, which stands as it were by itself—the remainder divide themselves into three groups of three each—two in each group coming with a warning, and the third without. (See Exodus 8:16; Exodus 9:8; Exodus 10:21.) In other respects, no great regularity is observable. There is a general principle of increasing severity in the afflictions, but it does not obtain throughout the entire series. The first three caused annoyance, rather than actual injury, either to persons or property. Of the next three, two were upon property, one upon both property and person (Exodus 9:10). Of the remaining three, two again inflicted injury on property, while one (the plague of darkness) was a mere personal annoyance. The exact character of the fourth plague depends on the proper translation of the word 'arob. The Jewish commentators connected this word with 'Ereb and 'Arab, words meaning "mingled" or "mixed;" and supposed a mixed multitude of animals—beasts, reptiles, and insects—to be meant. But the expression used throughout, which is ha-'arob, "the 'arob," marks very clearly a single definite species. So much was clear to the LXX; who rendered the word by κυνόμυια, "the dog-fly," which is not the common house-fly (Musca domestica), but a distinct species (Musca canina). Flies of this kind are said to constitute a terrible affliction in Egypt; but they attack men chiefly, and do no harm to houses or to the fruits of the field, whereas the 'arob is spoken of as a pest in the houses, and as "destroying the land" (Exodus 8:24). It has been, therefore, suggested that the Blatta orientalis, or kakerlaque, a kind of beetle, is really intended. These creatures suddenly appear upon the Nile in great numbers; they "inflict very painful bites with their jaws; gnaw and destroy clothes, household furniture, leather, and articles of every kind, and either consume or render unavailable all eatables"(Kalisch). They sometimes drive persons out of their houses; and they also devastate the fields.