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1. The Correlations of the Volumes and Surfaces of Organisms. 



By John A. Rvder, Ph.D. (Plate I.) 



2. The Growth of EugSena Viridis when Constrained Principally 



to Two Dimensions of Space. By John a. Ryder, Ph.D. 



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3. Descriptions of Three New Polychaeta from the New Jersey 



Coast. By J. Percy Moore. (Plates III-IV.) 



Volume I— No, s. $2.00. 



On the Embryos of Bats. By Harrison Allen, M. D. (Plate 



V-VIII.) 



Volume II. 



(Paper, $1.00; cloth, $1.25.) 

 Syllabus of Lectures on the Vertebrata. By Edward D. Cops 

 Ph. D., with an Introduction by Henry Fairfield Osborn, Sc. D. 



Volume III. 

 *Some Collected Scientific Papers of the late John A. Ryder, 

 Ph. D. 



Mathematics 



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No. I. 40 cents. 

 Contributions to the Geometry of the Triangle. By R. J. 



A LEY, A. M. 



Properties of the Locus r = Constant, in space of n Dimen- 



(^ sions. By Paul R. Heyl, B. S. 



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The Laboratory of Hygiene 



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 The Biological Relation between Bacteria and the More Highly 



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 Comparative Studies upon the Pseudo=diphtheria, or Hofmann 



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By D. H. Bekgky, M. D. 



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