204 



PROCEEDINGS OF THE CANADIAN INSTITUTE. 



Fis. 9. 



Tongue, teeth and cheeks in the O form, lips protruded,' oral 

 aperture reduced to half the size for O. 



Fig. 10. 



Place the tongue against the roof of the mouth, sink its fore-part 

 near the mid-arch of the hard palate, so that its tip rests 



