CONTENTS. 



PAGE 



I. Contributions to North American Botany. By Asa Gray . 1 

 II. Oti the Development of the Posterior Fissure of the Spinal Cord, 

 and the Reduction of the Central Canal, in the Pig. By 

 William Baknes 97 



III. The Relation of the External Meatus^ Tympanum, and Eusta- 



chian Tube to the First Visceral Cleft. By Albert H. 



TUTTLE Ill 



IV. The Fossil White Ants of Colorado. By Samuel H. Scudder 133 

 V. The Zodiacal Light. By Arthur Searle 146 



VI. On Certain Substances obtained from Turmeric. By C. Loring 



Jackson and A. E. Menke 211 



VII. On the Action of Phosphorous Trichloride on Aniline. By 



C. Loring Jackson and A. E. Menke 222 



VIII. Researches upon the Photography of Planetary and Stellar 



Spectra. By the late Henry Draper, M. D., LL. D. . 231 

 IX. Contributions from the Chemical Laboratory of Harvard Col- 

 lege. 

 On Mucophenoxybromic Acid. By Henry B. Hill and 



Edward K. Stevens 262 



X. Sir William HerscheVs Observations of Variable Stars. By 



Edward C. Pickering 269 



XL Contributions from the Chemical Laboratory of Harvard Col- 

 lege. 

 I. — On ^-Bromtetrachlorpropionic Acid. By Charles F. 



Mabery 279 



II. — On a- and ^-Chlordibromacrylic Acids. By Charles 



F. Mabery and Rachel Lloyd 281 



ni. — On ^-Dibromdichlorpropionic and ^-bromdichloracrylic 

 Acids. By Charles F. Mabery and H. H. Nich- 

 olson . . . , 289 



rV. — On Orthoiodtoluolsulphonic Acid. By Charles F. 



Mabery and George H. Palmer 293 



