taken in our waters ; but he had been told, though not by 

 that gentleman himself, that Prof. Agassiz has a specimen 

 so taken. 



Dr. Gould stated that the singing Mouse, caught in Bos- 

 ton, which he had exhibited at the last meeting, whose 

 performance at that time had been rather feeble, had aflford- 

 ed a sufficient excuse by producing the next morning three 

 young ones. Dr. G. had hoped to have preserved them, to 

 ascertain if they possessed their parent's musical powers ; 

 but they had all been destroyed by the mother, who has 

 since sung almost incessantly, and with more vigor than 

 before. Dr. G. said he had not yet ascertained by what 

 means the sounds were produced, but thought they might 

 be made by the labial fissure. 



Mr. Desor remarked, that the power of a mouse to utter 

 musical sounds was in analogy with a similar faculty pos- 

 sessed by another family of the Rodentia, the Marmots, to 

 which it has long been known to belong. 



The President exhibited casts of the Bones of Dinornis 

 giganteus, and compared them with those of the Ostrich 

 and Dodo. He also gave a sketch of Mr. Owen's latest 

 observations on the subject of the last-mentioned bird, and 

 the Apteryx of New Zealand. 



Mr. Stodder exhibited specimens of manufactured Gutta 

 Percha, and made some observations upon its properties. 



Mr. Desor, lately observing a luminous spot at night in 

 the waters of Boston harbor, took a boat and went to the 

 place, and obtained a bucket full of the water. It was 

 found abundantly stocked with c.ustacea, drawings of 

 some of which, as displayed by the microscope, were exhib- 

 ited by Dr. Gould. One of them appeared to be Calanus 

 arietis, Templeton. 



Mr. Desor remarked, that the light was of a bluish tinge, 

 and is, as he conceives, dependent on the will of the animal. 



