May 1st, was to bring tlie members and their friends togetlier for 

 social enjoyment and instruction, and especially to increase and de- 

 velop the interest in microscopical science. 



Tiie following was the Programme for the meeting : — 



MUSIC. 



Introductory, by the Presiding Officer. 

 Short Addresses by the following Gentlemen : — 



Professor Jeffries Wyman, of Harvard University, 



on the Teeth of Vertebrates. 

 Samuel H. Scudder, Sechj of the Boston Soc. of Nat. Hist., 



on the Mouth parts of Articulates. 

 Edward S. Morse, Curator of lloUusca at the Institute, 



on the Mouth parts of Mollusks. 

 Alpheus Hyatt, Curator of Palcmontology at the Institute, 



on the Mouths of Radiates and Protozoa. 

 Concluding Remarks by the Rev. E. C. Bolles, Sec'y of the 

 Portland Soc. of Nat. Hist. 



MUSIC. 



Examination of the Objects under the Microscopes. 

 Adjournment of the Meeting. Collation. 



Mr. Phippen stated that the special object of instruction this eve- 

 ning would be the Mouth parts of Animals, and that the various prep- 

 arations under the microscopes had been selected and made for this 

 purpose. He then introduced the several gentlemen who had kindly 

 consented to address the meeting. 



Professor Wyman, in a very instructive manner, explained the for- 

 mation and structure of the teeth of vertebrated animals, illustrating 

 his remarks by drawings on the black-board and by specimens. 



He first described an ideal tooth, pointing out the dilferent parts, 

 and then proceeded to show how the various forms of teeth met with 

 in animals, as those of a lion, horse, elephant, etc., were modifications 

 of one and the same ideal tooth. 



He alluded to some of the uses of teeth, besides those subservient 

 to mastication of food, such as the teeth of the Sword-fish for defence 

 and oflfence, of the Walrus for locomotion, of the Rattlesnake for the 

 innoculation of virus, etc. 



Whalebone was also described as having certain morphological 

 resemblances to teeth. 



