280 F. Waldo — Contributions to Dynamical Meteorology. 



No positive evidence of the change of a fragmental into a non- 

 crystalline rock, with the characteristics of an igneous one, is 

 available, except, perhaps, where the former have been affected 

 by dynamo-metamorphism and have been squeezed into the 

 surrounding massive and stratified rocks.* 



The red rock of Pigeon Point, however, has a thoroughly 

 crystalline structure throughout its greater part. It occurs 

 as dikes, bending and crumpling beds of other rocks beneath 

 which it has been thrust, and in every other respect acts exactly 

 like the most typical igneous rock. If its origin is indeed 

 secondary, we have in it the first instance in which a fragmental 

 rock can be traced into its corresponding noncrystalline deriva- 

 tive, and we can explain the change without the interposition 

 of the indefinite "metamorphic processes," that are relied upon 

 to explain so many of the difficult problems that arise in the 

 study of rocks. 



A detailed description of the rocks of the contact belt and 

 a fuller discussion of the origin of the red rock associated with 

 them, will appear in a forthcoming Bulletin of the U. S. 

 Geological Survey. 



Geological Laboratory of Colby University, Dec. 24, 1889. 



Art. XXX YI. — Recent Contributions to Dynamical Meteor- 

 ology ; by Frank Waldo. 



In the American Meteorological Journal for July, 1S87, I 

 have mentioned the most important papers that had appeared, 

 up to 1886, on the subject of Dynamical Meteorology. Since 

 then a number of important additions have been made to the 

 literature of the subject, and it is of these that I propose to 

 make a brief mention. While in the above mentioned article 

 there were given only a very few of the three-score papers 

 comprising the whole literature of the subject, in the present 

 list, all of the important very recent papers that have come to 

 my notice are catalogued. Copies of most of these papers 

 were received, from the authors, shortly after their publication, 

 and it was my intention to translate the shorter ones for repub- 

 lication in American journals (as a continuation of the still 

 unprinted Signal Service translations of the Guldberg and 

 Mohn, Oberbeck and Sprung papers), but the information that 

 some of these recent memoirs had already been translated 

 made such a work unnecessary. As, however, not all of the 

 papers in my list will be published in translation, the follow- 

 ing remarks may be found of use : and especially to those 

 readers who may be interested in the development of meteoro- 



* Reusch: Bommeloen og Karmosn med omgivelser geologisk beskrevne. 

 Kristiania, 1888. 



