918 



SCIENCE 



[N. S. Vol. XXXIX. No. 1016 



Any detailed discussion of the lithologic and 

 faunal characteristics of these several terranes 

 will be omitted from this paper since Dr. 

 Williams will publish this data at an early- 

 date. These are indicated in the section given 

 below which includes all of the formations 

 cut by the Niagara Gorge. 



NOTES ON A SHEEP THYREOID EXPERIMENT WITH 

 FROG TADPOLES 



At the time of the publication of Professor 

 J. F. Gudernatsch's paper on thyreoid feeding 

 experiments with the tadpole I was working 

 with some tadpoles and having some extra ones 

 I tried a short but similar experiment. I used 



Ordoviciaji. 



Lockport dolomite. 



Undifferentiated dolomite. 



Gasport limestone. 



De Cew limestone.21 

 Roehester shale. 

 Clinton formation. 22 



Irondequoit limestone. 



Walcott limestone. 



Sodus shale. 

 Medina formation. 



Thorold sandstone. 



Grimsby sandstone.21 



Cabot Head shale. 



Manitoulin beds. 



Whirlpool sandstone. 



E. M. Kindle 



21 Name proposed by M. T. Williams in paper 

 read before the Geological Society of America, 

 January, 1914. 



22 The term Clinton has been made to include in 

 certain publications, among them Folio 190 U. S. 

 G. S., the Rochester shale in addition, to the beds 



the large buU-frog tadpoles which had lain 

 over one winter. The hind limbs had begun 

 to develop and even to joint. They were 

 divided into two lots, the one for control and 

 the other for experiment. The experimental 



hitherto known as Clinton. Until satisfactory evi- 

 dence has appeared however, for such revision of 

 the meaning of an old and well-established name 

 there appears to be no reason for seriously con- 

 sidering either this proposed expansion of the 

 term upwards or its expansion downwards as one 

 geologist proposes. Frequent tinkering with the 

 meaning of well-established names is not likely to 

 serve any useful purpose. When revision of a 

 name does appear to be required it should, in the 

 writer's opinion, be accompanied by a full state- 

 ment of all the evidence in the case and ample time 

 for its discussion should be given before it is ac- 

 cepted. Such evidence has not appeared in this 

 case. 



