226 N. H. COWDRY. 



knowledge is for the most part supposition and inference, since 

 direct chemical analyses are obviously out of the question. 

 Their composition, as indicated by solubility with respect to 

 acetic acid, heat and other agents, is certainly subject to similar 

 variations in both. 



Their physiology is obscure; but their wide occurrence in all 

 protoplasm and their general similarity in all places must mean 

 something. It may mean that, in addition to certain specific 

 functions like the production of chlorophyll, they all have a 

 common duty or part to play in some fundamental vital mani- 

 festation like protoplasmic respiration. 



LITERATURE. 

 Asvadourova, Nina. 



'13 Recherches sur la formation de quelques cellules pigmentaires et des pig- 

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 Bayliss, W. M. 



'15 Principles of General Physiology, London, Longmans, Green, and Co., 



850 pp. 

 Bensley, R. R. 



'16 The Normal Mode of Secretion in the Thyroid Gland. Amer. Jour. Anat., 



Vol. 19, pp. 37-54- 

 Champy, C. 



'12 Recherches sur 1'absorption intestinale et le role des mitochondries dans 



1'absorption et la secretion. Arch. d'Anat. Micr., T. 13, pp. 50-170. 

 Cowdry, E. V. 



'14 The Vital Staining of Mitochondria with Janus Green and Diethylsafranin 

 in Human Blood Cells. Intern. Monatsschr. f. Anat. u. Phys., Bd. 31, 

 pp. 267-286. 

 '16 The General Functional Significance of Mitochondria. Amer. Jour. Anat. 



Vol. 19, pp. 423-446. 

 Dubreuil, G. 



'13 Le chondriome et le dispositif de 1'activite secretiore, etc. Arch. d'Anat. 



Micr., T. 15, pp. 53-I5I- 

 Duesberg, Jules and Henri Hoven. 



'10 Observations sur la structure du protoplasme des cellules vegetales. Anat. 



Anz., Bd. 36, pp. 96-100. 

 Faure-Fremiet, E. 



'13 Le cycle germinatif chez 1'Ascaris megalocephala. Arch. d'Anat. Micr., 



T. 15, pp. 435-757- 

 Forbes, E. B. and Helen M. Keith. 



'14 Phosphorus Compounds in Animal Metabolism. Ohio Agricultural Ex- 

 periment Station, Wooster Technical Bulletin, No. 5, 748 pp. 

 Guilliermond, A. 



'12 Recherches cytologiques sur le mode de formation de 1'amidon et sur les 

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