•21 



'90. Exact and approximate formulte for calculating the force at any 

 point in the plane of a circular circuit conveying an electric 

 current. 



'90. Some data as to the resistance to cutting of metals. 



'90. An apparatus for determining strength of electric currents in ab- 

 solute measure. 



'90. Specimens of diagrams obtained in testing iron and steel. 



'90. The relative magnetic resistance of air and iron. 



'90. On the solution of the equation : du= ._,_" ^., - 



Gray, Tho8., and C. Leo Mees. 



'89. Preliminary report on the changes. in density of wire in stretching. 

 Green, E. L. 



'89. The uses of infinity and zero in algebra. 



'91. Some suggested changes in notation. 



'91. [See Eigenmann, C. H.] 

 Har(;itt, C. W. 



'87. Some curious monstrosities in egg formation. [Am. X. XXII, p. 

 535.] 



'87. Xotes on Scajihiopus holbrookii. [Xot pub.] 



'88. Evidencesof shallow water deposition of silurian rocks. [Xot pub.] 



'88. Occurrence of Agkistrodon contortrix in Dearborn county, Indiana. 

 [Not pub.] 



'88. Some strange cases of color variation in animals. [Am. X. XXIII, 

 p. 449.] 



'89. Notes upon the economic phases of entomology and ornithology. 

 [Not pub.] 



'89. Some habits of the cray fish. [Am. M. M. .7., XI, p., 179.] 



'89. Some remarkable fioral variations. [B. G., XIV, p., 179.] 



'90. Food habits of the blue jay. [Not pub.] 



'90. Notes on Hydra fusca. [Xot pub.] 

 Hathaway, A. S. 



'91. A graphical solution for eiiuations of liigher degree, both for real 

 and imaginary roots. [Vr. V.] 



'91. On some theorems of integrations in quaternions. [Pr. V.] 



'91. A note on the early history of potential functions. [Pr. V.] 

 Hay, 0. p. 



'85. The present condition of our knowledge of Indiana herpetology. 



'86. A curious habit of the red-headed woodpecker. [Auk., Apl., '87.] 



'86. The higher classification of the amphibia. [Xot pub.] 



'86. Some reptiles and amphibians that appear to be rare in Indiana. 

 [Not pub.] 



'86. Some reptiles and amphibians that are to be looked for in Indiana. 



'86. Notes on the winter habits of Amblystoma tigrinum and A. micro- 

 stoma. [Am. N., 1890.] 



