RECORDS OF MEETINGS OF 1907 329 



tering during the great Appalachian upHft, and now revealed by the numer- 

 ous pegmatite intrusions cutting irregularly across the stratum of crystalline 

 schists, probably effected during Cambrian time. The other, after the close 

 of the Mesozoic, during the thrust of lava sheets between the sandstones 

 and shales of the Newark series of New Jersey, now indicated by many 

 faults across Manhattan Island and the adjacent Palisade Ridge. The 

 long period of cessation of uplift, of ensuing subsidence and extensive surface 

 erosion, offers the conditions in this region which promise long stability, 

 notwithstanding the slight tremors noted at intervals of thirty or forty years. 

 In the absence of disturbance from the glacial striae, everywhere abundant, 

 which serve as natural benchmarks to record changes of level or faulting, 

 we obtain therefore direct testimony to the established absence of tremor 

 during the long and approximately definite period which has elapsed since 

 the passage and withdrawal of the continental glacier. In the upper portion 

 of the Hudson River valley, however, some evidences of post-glacial faulting 

 have been observed. 



The Section then adjourned. 



Alexis A. Julien, 



Secretary. 



SECTION OF BIOLOGY. 



April 8, 1907. 



Section met at 8: 15 P. M., Vice-President Crampton presiding. 

 The minutes of the last meeting were read and approved. 

 The following program was then offered. 



C. L. Bristol and 



S. W. Bartelmez, Skin Glands of Bujo aqua. 

 George G. Scott, Regeneration in Fundulus. 



Maurice A. Bigelow, The Difference Between Nature Study and 



Biology. 



Summary of Papers. 



Messrs. Bristol and Bartelmez said in abstract: Bufo aqua is a South 

 American toad which is distinguished chiefly by its relatively large size and 

 by the characteristic poison secreted by glands in its skin. This toad was 



