PROCEEDINGS. LXVII 



five days with the blood at 104° F. would produce the same results 

 as blood artificially heated to 110° F. If so, it would account for 

 mistakes that have been made by persons inexperienced in exam- 

 ining the blood of fever patients, who reported the presence of 

 Bacteria, or broken blood corpuscles, as shown by Beal and others. 

 Dr. Taylor also explained a method of obtaining upon a screen 

 an apparent image of a microscopic object, by placing the micro- 

 scope horizontally and at right angles to the screen. While looking 

 through the microscope with one eye, the other is directed toward 

 the screen, upon which an image becomes apparent, its magnifica- 

 tion depending upon the distance of the observer from the screen. 



Sixty-Fifth Meeting, May 31, 1884. 



The President occupied the chair. Thirty members were pres- 

 ent. 



Prof. L. F. Ward, Chairman of the Committee on Cultivated 

 Plants growing in the District of Columbia, submitted a report of 

 progress. 



Mr. James E. Benedict made Remarks on the Recent Cruise 

 OF the Steamer "Albatross " in the Gulf of Mexico and the 

 Caribbean Sea, describing the events of the voyage, and exhibit- 

 ing some of the most remarkable objects collected. 



Ensign E. E. Hayden, U. S. N. , presented, through Prof. Ward, 

 a paper on A New Method of Figuring Fossil Leaves and other 

 Objects by the aid of Photography,* remarking that a saving of 

 time and increase of accuracy was thereby attained. The method 

 consisted in drawing with India ink upon a silver print photograph 

 the outline of the object to be figured, the defects of the photo- 

 graph being supplied by the draughtsman through comparison with 

 the specimen. The photograph is then dismissed, and a photo- 

 engraving is made from the black lines of the sketch which remains. 



In the discussion which followed, it was shown that this process 

 was novel in its successful application by the author to engrave 

 fossil leaves. 



Mr. J. A, Ryder read a paper on The Dfc:vEL0PMENT of Vivipa- 



