176 SOLDEEING APPAllATUS. 



The proper antagonism of the teeth is of the 

 very utmost importance ; for if any of the *' cusps" 

 be out of place, they disturb the equal distribution 

 of the force in biting, and tend to produce mischief 

 at the points holding those cusps in their assumed 

 position. In regulating the mouths of children, 

 it is of far more consequence to secure correctness 

 in this respect, than as to the actual number of 

 teeth remaining, provided the symmetry of the 

 anterior portion of the denture be not interfered 

 with. 



In thus noticing the reverse sources of lateral 

 pressure the short limits of a paper like the 

 present necessitate its being confined to a mere 

 summary of the general features. To have par- 

 ticularized many of the various peculiarities 

 assumed under the different forms, would have 

 added greatly to its length, and rendered it too 

 voluminous, although it might have tended ma- 

 terially to strengthen the position I have assumed. 

 Still, I trust sufficient has been pointed out 

 to show the importance of the subject, and to 

 obtain for it that consideration it deserves. 



Mr. Mather exhibited a Soldering Apparatus, and made the fol- 

 lowing commnnication : — 



That which I wish first to direct your attention 

 to is my gas and steam blowpipe. This will be 

 recognized as an adaptation of the old spirit self- 

 acting blowpipe; but the great heating power, 



