In common with all the aboriginal languages of America, the Esquimaux language is agglutinative, though, for the accommodation of the white strangers who visit their shores, they separate the words and use them in a single and simple form. In its purity it employs suffixes only for the definition and meaning, though complex sentences are often formed of a single word--that is, it is a polysynthetic in character. No philologist familiar with the whole territory has ever made a comparison of the dialects of the polar tribes, probably because no philologist is familiar with all the dialects spoken there. Everything therefore that would tend to throw any light upon the subject or to place before the scholar material by which to prosecute such philological studies must be regarded as of importance. The long residence of the Danes in Greenland and their intermarrying with the native Esquimaux, has led to a more thorough acquaintance with the language of the aborigines of that continent, than any other portion of the polar regions. In fact, as long ago as 1804 a complete dictionary of the Greenland tongue was published by Otho Fabricius, the translation being in the Danish language. With the exception of a few fragmentary vocabularies, this is the only work upon which the traveller or the student of the languages of the Polar regions can depend. Mr. Ivan Petroff, the Alaskan traveller, has taken some pains to compile a vocabulary of the various dialects of the Pacific races with whom he has sojourned, which, when published, will form another link in the chain by which the scholar may trace the spread of the Asiatic tribes along the northern seaboard of America. With the publication of the subjoined vocabulary, in continuation of the philology of the central or Iwillik tribes, the chain may be considered complete. With these people many of the familiar sounds of the civilized languages are found, as, for instance, the child's first words, an-an-na (mother), ah-dad-ah (father), ah-mam-mah (the mother's breast), ah-pa-pah (little piece of meat, either raw or cooked). Then there is the very natural expression for pain or sickness--ah-ah. Many words seem to indicate the meaning by imitating the action or sound to be described, as the motion of the kittewake when it swoops down toward you with its petulant cry, is well described by the word e-sow'-ook-suck'-too and the vibratory motion of a swinging pendulum by ow-look-a-tak'-took.