1873.] 113 [Dwight. 



June 18, 1873. 

 The President in the chair. Eighteen persons present. 



Prof. E. S. Morse read a paper on the " Embryology of 

 Terebratulina," which will appear in the Society's Memoirs. 



Dr. Dwight made some remarks on the action of the inter- 

 costal muscles. 1 From a careful study of the subject he had 

 concluded : — first, that the action of the intercostals during 

 ordinary respiration is very slight, if, indeed, there be any 

 other than ligamentous ; second, that both sets of muscles at 

 the upper part of the chest tend to raise the ribs ; third, that 

 owing to the fixing or drawing down of the lower rib, both 

 sets in the lower part of the chest may tend to draw the ribs 

 downward ; fourth, that by sudden contraction, drawing the 

 ribs together, they are muscles of spasmodic expiration ; fifth, 

 that position, muscular action, disease, deformity, and various 

 slight indefinable causes may modify the action of any part 

 of them. 



Mr. Bouve, in behalf of the committee on the Walker 

 Prizes, reported the award of a First Prize (sixty dollars) 

 to Dr. A. S. Packard, Jr., for an essay on the Development 

 and Transformations of the Common House Fly. 



October 1, 1873. 



The President in the chair. Eighteen persons present. 



Capt. Charles Bendire, U. S. A., was elected a Correspond- 

 ing Member, and Messrs. T. F. Ham, T. Sterry Hunt, Chas. 

 A. Richards, R. S. Warren and S. W. Winslow were elected 

 Resident Members of the Society. 



1 For a full exposition of this subject, see the Boston Medical and Surgical 

 Journal, June 8, 1873. 



PROCEEDINGS B. S. N. H. — VOL. XVT. 8 JANUARY, 1874. 



