REPORT OF ASSISTANT DIRECTOR. 25 



May 30. 



Mr. Lester F. Ward. — Recent flowering of the Ginkgo tree in Washington, with 

 remarks on the phylogeny of the genus. 



Dr. H. G. Beyer, U. S. N. — The physiological effects of cocaine. 



Dr. C. V. Riley. — Notes on the periodical cicada. 



Col. Marshall McDonald. — A theory to explain the phenomenal abundance of 

 migratory fishes in certain seasons. 



Dr. Thomas Taylor.— How to distinguish animal and vegetable fats. 



SOCIETY OF NATURALISTS OF EASTERN NORTH AMERICA. 



January 29. 



Charles S. Minot. — A new cabinet for microscopical specimens. • 



Chhrles S. Minot. — A new feeding trough. 



Charles S. Minot. — An apparatus for calculating intervals of days rapidly. 

 S. H. Gage. — The use of Muller's fluid for preserving the dark colors of animals. 

 S. H. Gage. — The use of collodion for protecting the rubber rings of museum jars. 

 S. H. Gage. — Glass bulb canulae for the injection of silver nitrate, gold chloride, &c. 

 H. F. OsBORN. — A simple method of injecting the entire arterial and nervous sys- 

 tems in different colors. 

 H. P. Bowditch. — A new form of stop-cock for rubber tubing. 

 R. Ramsay Wright. — On methods of staining series of sections. 



B. G. Wilder. — The use of slips in scientific correspondence. 



C. S. Minot. — On a new staining solution for histological use. 

 C. A. Ashburner. — Notes on barometric hypsometry. 



H. C. Lewis. — A summer school of geology. 



C. A. Ashburner. — Methods in practical geology. 



H. N. Martin. — The use of modeling clay to illustrate lectures. 



H. F. Osborn. — Methods of investigating the embryology of the opossum. 



Theo. Gill. - On osteological collections. 



January 30. 



C. D. Walcott. — The collecting and working of invertebrate palasontologic ma- 

 terial. 



G. K. Gilbert. — Geological bibliography. 



George P. Merrill. — Exhibition of a colored, enlarged photo-micrograph of a thin 

 section of a rock. 



G.Brown Goode. — Description of the unit-system of cases used in the U. S. National 

 Museum. 



J. A. Ryder. — On Museum alcoholics. 



B. G. Wilder and S. H. Gage. — An investigator's table with double or triple revolv- 

 ing top and movable book-rests. 



R. R. Wright.— On the use of series of sections in laboratory teaching and a con- 

 venient method of obtaining them. 



H. A. Howell.— On the use of terrapin blood for the demonstration of the phenom- 

 ena of coagulation. 



Harrison Allen.— Exhibition of the palatograph. 



C. V. Riley. — On the mounting of alcoholic specimens in insect cabinets. 

 C. V. Riley. — On a preserving fluid for soft galls and plant tissues. 

 John Murdoch. — New application of the towing net in the Arctic regions. 



F. W. True. — On the preservation of type specimens. 



G. Brown Goode. — The use of photography for making large diagrams. 

 W. H. Niles. — Shall we define groups of organisms? 



L. F. Ward.— On a method of rapid drawing for photo-engraving. 

 11. E. Call.— Dentition of certain mollusks. 



