80 TRANSACTIONS OF SCIENTIFIC SECTION. 



tootMes's Mammalia wherever they occur. Such are 

 cases where the teeth become extremely simple, as in the 

 honey-eating marsupial Tarsipes, the carnivore Proteles, 

 the Pteropod bats, and the aye-aye. Also where teeth 

 are lost from the series, as in canine genus Dysodus, and 

 in man. The loss of the hallux and pollex without cor- 

 responding gain, in various genera, may be regarded in 

 the same light. 



In conclusion, the progressive may be compared with 

 the retrogressive evolution of the Vertebrata, as follows : 

 In the earlier periods and with the lower forms, retro- 

 gressive evolution predominated. In the higher classes 

 progressive evolution has predominated. When we con- 

 sider the history of the first class of vertebrates, the 

 Tunica ta, in this respect, and compare it with that of the 

 last class, the Mammalia, the contrast is very great. 



NOVEMBER 5, 1884— TWENTY-SEVENTH STATED MEETING. 



Prof. W. B. D wight, chairman, presiding ; many mem- 

 bers and guests present. 



The first of a series of papers on the "Gyroscope" 1 

 was read by C. B. Warring, Ph.D. Several forms of the 

 instrument were exhibited and many interesting experi- 

 ments were made, fully illustrating the theory of its ac- 

 tion. 



NOVEMBER 19, 1884— TWENTY-EIGHTH STATED MEETING. 



Prof. W. B. Dwight, chairman, presiding ; ten mem- 

 bers and several guests present. 



A paper discussing the motions of the top, the gy recy- 

 cle, the gyrostat, and the Bohnenberger machine, was 

 read by Dr. Warring. Many curious experiments were 

 made, illustrating the rationale of these instruments. 



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