240 PROCEEDINGS OF THE ACADEMY OF [1896. 



ORIGINAL RESEARCH. 



1 — On the laws of digital reduction. Amer. 'Nat, Oct., 1877, 

 ]>p. 603-607. (Points out the modes of modification of the digits 

 in response to the methods of use in the different forms of mamma- 

 lia). 



2 — On the evolution and homologies of the incisors of the horse. 

 Proc. Acad. Nat. Sci. Phila., 1877, pp. 152-154, 4 figs, in text. 

 (Traces the history of the " pit " or '* mark " in the incisors from 

 the early equine forms to the existing domestic horse). 



3 — Note on the color variation in mammals. Proc Acad. Nat. 

 Sci. Phila., 1877, pp. 272-273. (Discusses the probable causes 

 which lead to a disturbance of the symmetry of coloration observed 

 in wild animals when brought under the influence of domestication, 

 assigning as that cause the protection which they receive under the 

 latter, as a result of which asymmetrical and parti-colored individ- 

 uals are protected and preserved to perpetuate their peculiarities, 

 wild individuals of that character the more readily becoming the 

 prey of enemies). 



4 — On the growth of Cocculus indicus. Proc. Acad. Nat. Sci. 

 Phila., 1877, pp. 284-285. (Points out the habit or tendency of the 

 terminal part of the newer apical growth to twine). 



5 — The significance of the diameters of the incisors in rodents. 

 Proc. Acad. Nat. Sci. Phila., 1877, pp. 314-318, 1 fig. in text. 

 (Points out the fact that the greatest diameter is in the line of great- 

 est stress and is correlated with increased use). 



6 — A dog with supernumerary toes. Proc. Acad. Nat. Sci., 

 Phila., 1877, p. 321. 



7 — On the mechanical genesis of tooth forms. Proc. Acad. Nat. 

 Sci. Phila., 1878, pp. 45-80, 11 figs, in text. (This paper points 

 out for the first time the correlation existing between the forms of 

 the crowns of the teeth in the various groups of mammalia and the 

 manner and direction in Avhich the jaws are used to bring stress 

 upon the teeth). 



8 — On Polyxenes fasciculatus. Proc. Acad. Nat. Sci. Phila., 

 1878, p. 223. 



9 — Description of a new species of Smynthurus. Proc. Acad. 

 Nat. Sci. Phila., 1878, p. 335, 1 fig. in text. Smynthurus quadri- 

 mandatns sp. nov. 



10 — On the form of the stapes in Dipodomy^. Amer. Nat., 1878, 

 p. 125. 



11 — On like mechanical (structural) conditions as producing 

 like morphological effects. Amer. Nat., 1878, pp. 157-160. 



12 — Discovery of two remarkable genera of minute myriapodsin 

 Fairmount Park {Polyxenes and Pauropus). Amer. Nat., 1878, 

 pp. 557-558. 



13 — Bees gathering honey from the Catalpa. Amer. Nat, 1879, 

 p. 648. 



14 — A monstrous frog. Amer. Nat., 1878, pp. 751-752. 



