NATURAL SCIENCES OF PHILADELPHIA. 6 



It was also voted that a committee of three be appointed to carry 

 out the resolution and to take proper steps to have those gentlemen 

 not members of the Academv made such. The Chair appointed 

 Prof F. G. Smith, Drs. H. C.'Wood and W. Pepper. 



Adjourned until called by the officers of the Biological Depart- 

 ment. 



Biological Department, May Ath, 1868. 

 Vice Director, S. W. Mitchell, M. D., in the Chair. 



Three members present. 



The following gentlemen, also present, members of the Academy 

 of Natural Sciences, on complying with the By-Laws of the Academy 

 on the subject of Departments, were also declared members : — Wm. 

 Pepper, M. D., H. M. Bellows, M. D., F. W. Lewis, M. D., Isaac 

 Norris, M. D., James Tyson, M. D., Harrison Allen, M. D., H. C. 

 Wood, M. D., R. S. Kenderdine, M. D., T. C. Stellwagen, M. D., 

 J. H. McQuillen, M. D., J. G. Hunt, M. D.. C. N. Peirce, D. D. S., 

 C. A. Kingsbury, D. D. S. 



Eleven gentlemen interested in the proposed Microscopical So- 

 ciety, but not members of the Academy, were also present by invita- 

 tion. 



Dr. J. H. McQuillen exhibited a number of sections of human 

 teeth which he had prepared, demonstrating the interglobular spaces 

 in dentine, and also made some extended remarks descriptive of 

 his investigations in this direction, which he proposes to publish in 

 the Proceedings. 



Biological Department, May l^th, 1868. 

 The Director, Jos. Leidy, M. D., occupied the Chair. 



Thirteen members present ; eleven, not members, present by in- 

 vitation. 



Dr. Tyson exhibited specimens of black crystalline forms, gener- 

 ally rhomboidal, obtained from fecal discharges, and which pre- 

 sented the characters of lucmin crystals, as described by Virchow in 

 " Cellular Pathology." 



Dr. S. W. Mitchell having recently studied the life of the rattle- 

 snake, remarked, with regard to the growth of their rattles, that they 

 are produced at all times, even when the reptile has been long 

 deprived of food, and that they are not produced one in each year 

 of the life of the reptile, as commonly thought. 



Biological Dej^artment, June 1st, 1868. 

 Director, Jos. Leidy, M. D., iu the Chair. 

 Sixteen members present, also nine gentlemen, proposed members. 

 The following were declared members of the Department : — 

 Jno. Neill, M. D., T. L. Buckingham, D. D. S., K. AV. Hargadine, 

 M. D., E. L. Hewitt, D. D. S., Aug. F. Miiller, M. D., Edw. 



