November ^th, i 



President Nipher in the chair ; eleven membrs present. 



The librarian announced that the Academy had received as 

 gifts Dr. Anton Fritsch's " Vogel. Europa's" from Mr. Julius 

 Hurter, and Judge Holmes' " Realistic Idealism in Philosophy 

 itself" from its author. The corresponding secretary was in- 

 structed to express to both these gentlemen the thanks of the 

 Academy for their valuable donations. 



Dr. Todd exhibited a skull taken from the body of an old wo- 

 man having a number of anomalies in structure : Both clavicles 

 were rudimentary ; the inter-frontal suture persisted in its upper 

 part to the extent of one inch, leaving a gap \ inch wide extend- 

 ing from near the coronal suture ; the parietal bones were in two 

 parts each, the separating sutures running parallel to the inter- 

 parietal ; there was the appearance of a very imperfect thiad 

 dentition in the anterior dental arch of both jaws ; the zygomatic 

 arch on each side was incomplete ; there was also marked 

 irregularity in the relation of the inferior maxillary to the tem- 

 poral bone. 



Mr. Engler made some remarks concerning properties of the 

 cone of revolution. 



Mr. Jas. A. Seddon remarked, with reference to the method 

 he described at last meeting of measuring the opacity of different 

 colored solutions, that the "dark point" involved an error of about 

 30%, due in large part to the accommodation of the eye to the 

 reduction of the light. 



November ic^th, i88y. 



President Nipher in the chair ; eleven members present. 



A paper by Mr. J. H. Kinealy on "The Pressure of the Wind 

 on Roofs and Inclined Surfaces" was read by Mr. Jas. A. Sed- 

 don, and referred to the Committee on Publication. 



A paper by Dr. Liideking on "The Hydration of Colloids" was 

 read by Mr. Thacher, and referred to the Committee on Publi- 

 cation. 



Mr. Engler exhibited some drawings in explanation of his re- 

 marks at last meetins: on the cone of revolution. 



