The general rules for the development of cerebral -ṣ- in Sanskrit account for its appearance after k, r, ṛ, i, and u, and in this case the statements of historical phonology correspond to the elementary rules of Sanskrit grammar. There exist, however, a certain number of words in which cerebral -ṣ- appears after an a-vowel (a or ā), which remain to be accounted for. A certain number of these are taken care of by Fortunatov's law (e.g. pāṣāṇa- “stone”: Germ. Fels) but they form a minority of the group. Certain other such words (e.g. jálāṣa- “refreshing”, mṣa- “bean”) I have dealt with in an article to be published elsewhere. The two words which appear in the title of this article differ from the other words in question inasmuch as the -ṣ- is the first member of a consonant group, and its explanation is dependent on this fact.