302 RECORDS. 



cule. The theoretical sparking potential thus deduced agrees 

 very closely with the experimental value. 



Charles C. Trowbridge, 



Secretary. 



SFXTION OF BIOLOGY. 

 January ii, 1904. 



Section met at 8.15 P. M., Vice-President Underwood pre- 

 siding. The minutes of the last meeting of the Section were 

 read and approved. 



The following program was then offered : 



Henry F. Osborn, The Classification of the Reptilia. 



Adele M. Fielde, The Sense of Smell in Ants. 



Summary of Papers. 



Professor Osborn presented the history of the classification of 

 Reptilia as follows : (i) Recognition of the Cotylosauria as the 

 most primitive group of reptiles, by Cope and Baur. (2) The 

 separation of the Anomodontia, Chelonia and Sauropterygia as 

 reptiles with a single temporal arcade, by Smith Woodward and 

 Broom. (3) The affiliation of the Ichthyosaur with the two- 

 arched rather than the single-arched reptiles, by Baur and Mc- 

 Gregor. (4). The recognition of SpJieiiodon as the ancestral 

 type of the two-arched reptiles, by Baur and others. (5) Sepa- 

 ration of the reptiles into two great groups of single-arched and 

 two-arched types, by Smith Woodward and Broom. (6) The 

 demonstration that reptiles are separated not only by the struc- 

 ture of the temporal arch but by many fundamental characters 

 into two distinct groups, by Osborn and McGregor (1902). (7) 

 Consequent division of the Reptilia into two subclasses Synap- 

 sida and Diapsida, by Osborn (1903). (8) The proposal of the 

 Diaptosauria to include all of the most primitive two-arched 

 reptiles without armature, by Osborn (1903). (9) The classifi- 

 cation of the Reptilia according to the accompanying table 

 (1903-4). 



