[ 26 ] I would here refer the reader to the references I made to the work issued by Pfungst; they may be found in "The Animal Soul" (Reports of new observations made with respect to horses and dogs), 2nd ed. (W. Jung) 1916, p. 38.
[ 27 ] Karl Krall, "Denkende Tiere, Beiträge zur Tierseelenkunde, auf Grund eigener Versuche," Leipzig, Engelmann, 1912.
[ 28 ] Rolf could only rap with one paw owing to the other fore-paw having been injured; he generally leaves out the vowels, these being already contained within the consonants. This habit gives rise to a somewhat curious form of writing.
[ 29 ] Note.—The numbers in the text refer to the Bibliography at the end.
[ 30 ] N.B.—It may also be that the "quite incomprehensible words" have not any meaning at all, or at least, not any relation with the mechanism of the glossolalia, but are simply the product of taps made by the animal just for the sake of doing something.