8 



England. By W. G. Farlow, M.D. (B). 

 In Reps. U. S. Fish Commission, Washington, 1871 and 1872. 



Maine. 

 -^-7 List of Plants noticed in the Maine woods in the years 1853 and 



^ 



o 



1857. By H. D. Thoreau. (B). 

 In Appendix to "Maine Woods," Boston, 1866. 



Me 



September, 1872, in connection with the work of the U. S. Fish 

 Commission under 'Prof. S. F. Baird. By Daniel C. Eaton. (B.) 

 In Trans. Connec. Acad. Sci. Vol. ii., New Haven, 1873. 



Massachusetts. 

 /^( List of the native Trees of Massachusetts, with notes upon cer- 



tain naturalized species. By F. B. Hough. 



iK 



Washin 



^1 Studies of the Essex Flora ; a complete enumeration of all Plants 



found growing naturally within the limits of Lynn and the towns 

 adjoining. By C. M. Tracy. (B). 8vo. pamph. pp. 87. Lynn, 1856. 



^3 Woody 



-~ -- '* ^^^^tii.j J «. not \ji. J. n„ca aiiu. oiiiUL>:5 llctlUl- 



ally growing m the County, and of those extensively introduced. 

 By John Robinson. (B). In Bullet. Essex Inst.,Vol. xi. Salem, 1879. 

 " I rees and Flowers of Cape Ann, by Calvin W. Pool, and of Pigeon 



Cove and vicmity, by Henry C. Leonard. (A). Bostoa, 1873. 

 4 i I' lora of Georgetown, Mass. By Mrs. C. N. S. Horner. (A). 



1 ub. m Georgetown Advocate, Feb. and Mar., 1876. 

 t| t. Flora of Essex County. rincludes Phaenogams, vascular Cryp- 

 togams, _ Lichens, Mosses, Hepaticae, Characeae, and marine 

 Algae with extensive notes, and historical preface and sketch of 

 early Essex County botanistsj. By John Robinson. • 

 Pub. by Essex Institute, 8vo., pp. 170, Salem, 1880. 



Rhode Island. 

 'Algae Rhodiaceae. A list of Rhode Island Algae. By Stephen 



T. OIney. (B). In Lens. Vol. i., Chicago, 1872. 

 ^^Contributions toward a complete list of Rhode Island Diatoms 



By S. A. Briggs, (addition to OIney's catalogue). 

 In Lens. Vol. ii., Chicago, 1873. 



W 



Flo7uers. 



D.» • . „ X N. L. B.' 



10. Botanical lAoi^^,— influence of Altitude on Colors of 



Nature. 



ly been making observations in Austria and Hungary on the modifi- 

 cations exhibited by the same species of plants at various altitudes, 

 and his researches have especially been directed towards ihe differ- 

 erices shown in the coloration of flowers. A comparison of the tints of 

 a arge number of species in two, three, four and sometimes five lo- 

 calities of increasing altitude has shown a notable deepening of the 

 color with the increase in height of the station. This variation was 



difolia 



contrary, not well sliown m Thymus Serpyllilm and Geranium sylvati- 



•Communicated by Mr. F. S. Collins. 



t " " Mr. John Robinson, 



