94 TWELFTH REPORT. 



ill this connection it should be said tliat air bubbles are likely to develop 

 here aiid there under the cover if the silicate has been made too dilute 

 by the water already ou the specimen in mounting, (3) Once mounted 

 and hardened, the cover and slide are fixed together and can never be 

 cleaned again, (-f) In mounting with this material, air bubbles are 

 more likelv to be mixed in than is the case with either balsam or givcerine- 



«. c t. 



It is not the intention here to suggest that sodium silicate replace 

 either balsam, glycerine or any other of the standard substances, but 

 rather to introduce it as a useful addition to our mounting equipment, 

 • for fresh or undehydrated specimens. 



Bast Lansing, Mich., April 1910. 



