388 ANNAL>^ XEW YORK ACADEMY OF FfCI i:\Ci:,S 



. SUMMAKY OF PAPERS 



T)r. Stevens stimiiravized the results of his microscopic studies under 

 the followijio- topics, which were illustrated hy enlarjred drawings: 



(1) Under the influence of lisht tlie most simple forms of plant life behave 



much as do the most elementary forms of iinimal life. 



(2) Plants of a single cell move about as thbu^Mi controlled by will power, 



seek or avoid the stimulus of luminoiis waves. 



(3) There is a gradual evolution of what we call visual sense, from the most 



elemental impression to the complete perception of form, size and color 

 of objects. 



(4) Primitive visual organs in leaves of certain plants. 



(5) Illustrations of the influence of luminous waves shown by various plants 



and animals rising gradually in the scale of organism. 



(6) Specialization of locations and organs for sensibility to luminous impres- 



sions. 



(7) Visual organs in more advanced forms. 



(8) Nature of sense of perception of foim. 



Dr. Gregory illustrated the osteology of the principal recent and ex- 

 tinct members of the Indrisin^, a group of herbivorous Malagasy Pri- 

 mates, showing that in the more deep-seated characters of the skull and 

 limbs the Indrisinae are true Lemurs, and that structurally they represent 

 a specialized herbivorous modification of the primitive Eocene lemur type. 

 The Section then adjourned. 



William K. Gregory, 



Secreta7-y. 



SECTION OF ASTEONOMY, PHYSICS AND CHEMISTRY 



16 November, 1914 



Section was called to order at 8:15 p. m., \"ice-President Charles- 

 Baskerville in the chair. 



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



The nomination of officers for 1915 was referred to the Council. 



The scientific programme of the evening consisted of the following^ 

 titles : 



James Kendall, Toxization Eqttilibrtuim. 



Reinhard A.Wetzel, Titk Stark Effect or Electric EESoi.UTinv of 



the Spectra of the Elements. 



Summary of Paper 



Mr. Kendall said in abstract: The diverfjences from the dilution law^ 

 exhibited by acids in aqueous solution have been critically investigated. 



