Record. xxxi 



Mr. C. F. Baker presented an interesting embryological 

 exhibit, consisting of fresh material, dissections, and slides 

 under the microscope, representing the development of the 

 chick during the first forty-eight hours of segmentation. Mr. 

 Baker's purpose in giving the demonstration was to show that 

 with inexpensive apparatus, and inexpensive models, prepared 

 of cardboard and paper, it was within the power of any high 

 school teacher of biology to give a practical knowledge of ver- 

 tebrate embryology to this extent as a part of the regular 

 laboratory and class-room work. 



The secretary presented a letter from Professor Engler, 

 tendering his resignation as President of the Academy, be- 

 cause of his approaching removal from the city, the resig- 

 nation to go into effect not later than June 15. It being 

 Professor Engler' s wish that immediate action should be 

 taken in the matter, the resignation was accepted and the Sec- 

 retary was instructed to state on the announcement of the 

 next meeting of the Academy that a committee would then 

 be elected to submit nominations for the Presidency of the 

 Academy, in accordance with the provisions of the By-Laws. 



Dr. William A. Shoemaker, of St. Louis, was elected to 

 active membership. 



One person was proposed for active membership. 



May 20, 1901. 



President Engler in the chair, twenty-six persons present. 



The Council reported that the request of Mr. Arthur Mac- 

 Donald presented at the last meeting had been declined as not 

 coming within the scope of the Academy, in the judgment 

 of the Council; and the Entomological Society of London 

 had been canceled from the exchange list. 



Professor George Lefevre delivered an address on The 

 advance made in zoology during the nineteenth century. 



A paper by Professor F. E. Nipher, entitled The specific 

 heat of gaseous nebulae in gravitational contraction, was 

 presented and read by title. 



