1874.] 295 [Hitchcock. 



Prof. C. H. Hitchcock gave an account of the Helderberg 

 Rocks of New Hampshire. From the discovery of char- 

 acteristic fossils, especially a Pentamerus, perhaps the P. 

 l&iightii, these rocks seem to belong to the lower Helder- 

 berg series. Prof. Hitchcock, with the aid of map and 

 diagrams, described in detail the geology of the northern 

 portion of Grafton Co., N. H., in which the Helderberg rocks 

 occupy three areas in the neighborhood of Littleton, North 

 Lisbon, and Lyman. 



Mr. S. H. Scudder exhibited a large series of drawings of 

 Georgian Insects, principally of the transformations of Lepi- 

 doptera, executed by Abbot more than fifty years ago. 



One collection was painted for Dr. Oemler, of South Carolina, and 

 has recently been purchased by friends for the Society; it consists of 

 nearly two hundred colored drawings of Lepidoptera, very few of 

 which are given in the work of Sir James Edward Smith. Another 

 collection formerly belonged to Mr. Raddon, of England, and was 

 afterwards given to Dr. Asa Gray, who has identified the plants figured, 

 and has now transferred it to the Society's library; it is composed of 

 about the same number of sheets, mainly representing the transform- 

 ations of Lepidoptera, nearly all distinct from those in the first series, 

 or those published by Smith. Mr. Scudder added a brief account of 

 other similar collections, especially of those in the British Museum, 

 and gave a short sketch of Abbot's life. 



The thanks of the Society were voted to Dr. Gray for his 

 very valuable gift. 



The amendments to the By-Laws, proposed at the last 

 meeting, were then discussed, and the question being put to 

 vote, the following amendments were adopted : — 



That the following Section be added to the By-Laws : — 



" Section II. Of the Election of Officers. 



"Article 1. Whenever any existing or anticipated vacancy in 

 the list of officers is to be filled by election, a Nominating Committee 



