334 The Microscope. 



large comparator is mounted in a uniform temperature room with 

 an air space on every side, and with triple windows on the north, 

 protected, when not in use, by blinds. 



William Hoskins, Secretary. 



WESTERN SOCIETY OF NATURALISTS. 



A T the recent meeting of this Society, held at Champaign, 111., 

 -*■ -^ October — , the following officers were elected for the 

 ensuing year: 



President — T. C, Chamberlain. 



Vice-Presidents — T. J. Burrill, D. S. Jordan, S. Calvin. 



Secretary — J. S. Kingsley. 



Treasurer — J. M. Coulter. 



There was an attendance of twenty-eight, representing Ohio, 

 Indiana, Illinois, Iowa, Michigan and Wisconsin. The papers were 

 largely on methods of instruction. 



J. S. Kingsley, Secretary. 



ELEMENTARY DEPARTMENT. 



RUDIMENTS OF PRACTICAL EMBRYOLOGY.* 



W. p. MANTON. 

 CELLOIDINE METHOD. 



§ 14. After hardening and staining, if desired, embryos may 

 be placed for several days in a thin solution of celloidine, and then 

 transferred to a thicker solution, where they may be left for a week 

 or even longer, without injury. A cork is then wrapped with stiff 

 paper ^ — the latter projecting an inch or more beyond the former — 

 and the top of the cork moistened with celloidine. When this has 

 partially hardened, it is slightly moistened with ether, the specimen 

 is placed upon it in the desired position, and the cell then filled up 

 with the celloidine. After exposing this to the air until a film has 

 formed on top, it is carefully lowered into a jar of 75 per cent, 

 alcohol and allowed to harden. After a few days the paper may be 

 removed, and the embryo will be found firmly embedded in the 

 transparent celloidine. 



Sections of the above may be mounted on a collodionized slide, 



*Copyrighted 1888. 



