440 RECORDS 



that they point out a way to a more complicated experimenta- 

 tion in induced automatic movements. 



Professor Cattell's paper described experiments on the per- 

 ception of moving surfaces, which show that a time series may 

 be perceived as a spatial continuum, and explained that the same 

 phenomena held in the ordinary vision of daily life. Although 

 the eyes, head and body are in continued movement, and the 

 images on the retina are constantly shifting, the field of vision 

 appears to be distinct and stationary. Thus, if one glances 

 along a row of books, images follow one another on each reti- 

 nal element in rapid succession, but these successive and rapid 

 changes result in the perception of a space continuum, all the 

 objects being distinct and arranged side by side. 



Professor Buchner described, with the aid of sketches, the 

 fixed visualizations experienced since childhood by a woman 35 

 years of age. There are three distinct, uncolored, tridimensional 

 forms. The first is half fan-like in shape, lying almost entirely 

 to the left of the mental point of regard, and includes the num- 

 bers from I to 100. The second includes the names of eight 

 days, from Sunday to Sunday. The third has the names of the 

 twelve months from January to December. The paper pointed 

 out the elements which must appear in any theory of the gene- 

 sis of the phenomena to which this group belongs. 



Charles H. Judd, 



Secretary. 



PUBLIC LECTURE. 



under auspices of the section of biology. 



January 29, 1900. 



Professor G. H. Parker, of Harvard University, delivered a 

 lecture on The Neuron Theory in the Light of Recent 

 Discoveries. 



The lecturer gave a summar\' of the development of our 

 knowledge of the histological structure of the nervous system, 

 and contrasted with the neuron theory as widely understood 



