GLYCOGEN IN THE NERVOUS SYSTEM 463 
completely. It may be said in passing that physiologists have not 
gone far beyond Bernard. It is however, more widely distributed than 
he thought, and its locations have been more completely mapped out 
since his day. 
BrRAMMERTZ, Wm. 1915 Ueber das normale Vorkommen von Glykogen in der 
Retina. Arch. f. mikr. Anat., Bd. 86, pp. 1-7. He reports the pres- 
ence of glycogen in the rods and cones of frog, pigeon, rabbit and 
between them in the pike, and in the eye of the house fly. 
CREIGHTON, CHARLES 1896-1899 Microscopie researches on the formative 
property of glycogen. Part I with five colored plates, 152 pages. 
Part II (99), Glycogen of snails and slugs. Nine plates, 127 pages. 
In Part I he figures and discusses glycogen in the choroid plexus of 
the cat embryo, pl. i, figure 3; and a combination of fat and glycogen 
in the developing mammary gland, pl. iv, figure 20. All students of 
glycogen would do well to consult this work. 
Cuamot, E. M. 1915 Elementary chemical microscopy. 
Duaaar, B. M. 1911 Plant physiology. This work gives a good account of 
starch and its transformations in plants. 
Ficnpra, G. 1904 Ueber die Verbreitung des Glycogens in Verschiedenen 
Arten. Ziegler’s Beitrige zur path. Anat., Bd. 36, pp. 273-339. 
Fichera gives references to 311 papers. 
Gags, 8. H. 1905-1906 Glycogen in the nervous system. Reports and dem- 
onstrations at the Association of American Anatomists. Am. Jour. 
Anat., 1905, pp. xii—xiii; 1906, pp. xiii—xv. 
Lusk, GRAHAM 1906 The elements of the science of nutrition. Discusses 
carbohydrates, including glycogen, in nutrition. 
MENDEL, L. B. anp LEAVENWoRTH, C. S. 1907, The American Journal of 
Physiology, vol. 20, pp. 117-126. Chemical studies on growth; III, 
the occurrence of glycogen in the pig. They used the brain substance 
in rather large amounts and got only negative results. Their final 
conclusion is that embryos do not have a large amount of glycogen 
in their tissues. The author showed Dr. Mendel the microscopic sec- 
tions of embryo pigs and he could not help thinking that a great deal 
of glycogen was present. In case of the brain it is entirely possible 
that the amount of glycogen in the choroid plexus might not be 
sufficient to give results in ordinary analyses, although they are most 
striking and convincing in microscopic preparations. 
Pritcer, E. F. W. 1905 Das Glykogen und seine Beziehungen zur Zucker- 
krankheit. Zweite Auflage. Very many references. 
SmirH, Lucy Wricur 1912 Glycogen in Insects, especially in the nervous 
system and eyes. Science, vol. 35, March i. Much glycogen is 
found in both compound and simple eyes and in the nerve cells of 
the ganglia from all parts of the body, but not in the nerve fibers. 
