400 ANNALS NEW YORK ACADEMY OF SCIENCES 



Dr. Washington described the features observed on a recent trip to the 

 Province of Bahia. The economic resources of a mineral character -vrere 

 noted, especially manganese, copper, diamond and carbonado. This dis- 

 trict is the chief source of this last mineral. Professor Kemp, Dr. Kunz 

 and Mr. Tower joined in the discussion. 

 The Section then adjourned. 



Charles P. Berket, 



Secretary. 



SECTION OF BIOLOGY. 



January 10, 1910. 



Section met at 8:15 p. m., Eoy W. Miner presiding. ^ 



The minutes of the last meeting of the Section were read and approved. 

 The following programme was then offered : 



Roy W. Miner, Some Eemarks on Myriapods. 



Max Morse, The Ultra-Microscope and its Applica- 



tion TO THE Study of Microscopically 

 Invisible Particles. 



Barnum Brown, . Notes on the Eestorations of the Cre- 



taceous Birds Hesperornis and Bap- 



TORNIS. 



Alexander Petrunkevitch, Some New or Little Known American 



Spiders. 



Summary of Papers. 



Mr. Miner gave an illustrated talk on the Myriapods, dwelling on their 

 classification, evolution and morphology. Handlirsch's theory of the 

 derivation of the Crustacea, Myriapoda and Hexapoda from pro-anneli- 

 dan stock through trilobite forms was discussed in some detail, special 

 attention being given to the evolution of the ancestral insects (Paleo- 

 dictyoptera) from the trilobites and their relation to the primitive myria- 

 pod stock. All the more typical myriapods were illustrated and their 

 striking anatomical features commented on. 



The paper was illustrated with lantern slides. 



Mr. Morse said in abstract : The ultra-microscope was devised by Zsig- 

 mondy and Siedentopf on the principle determined by Tyndall, that if a 

 solution is examined under the microscope by means of horizontal illumi- 

 nation and not by light transmitted through it by the sub-stage mirror, 



