G. F. Barker—Physiological Chemistry. 49 
what similar to the Protichnites.* Indistinct impressions, re- 
sembling those of Canada, have indeed been observed by Mr. 
Daniels in this formation in Wisconsin, although not at the 
same horizon in which the remains were found. The Aglaspis 
of the Potsdam, and the Hurypterus of the Upper Silurian at 
least indicate the general affinities of the Crustaceans that have 
recorded their existence in the Protichnites, and the remains of 
the animals themselves will doubtless be brought to light at no 
distant day, and thus reveal their true nature. 
Art. VI.—WNotices of papers in Physiological Chemistry— 
No. II; by Grorcze F. Barker, M.D. 
5. On the formation of sugar in the liver. 
[Concluded from vol. xlvii, p. 398.] 
(64.) On the 24th of January, 1861, Dr. Pavy presented 
a paper to the Royal Society,+ upon the influence of alkalies 
, on the production of sugar. His previous experiments showed 
_ that the introduction of sodic carbonate into the circulation of 
an animal whose sympathetic nerve was divided, prevented the 
diabetes which would normally>result ; that on excising, for 
_ example, the superior cervical ganglia, or on divi ng the as- 
_cending branches of the superior thoracic Saag of a dog, 
_ diabetes would appear almost uniformly ; and that in ten ex. 
_ periments now reported, about 200 grains of crystallized sodic 
_ carbonate, introduced into the jugular vein before the opera- 
_ tion, entively prevented this diabetic state. Under this treat- 
men nt, the urine is copious, light-colored, and alkaline to test- 
papers, effervescing strongly on the addition of an acid, But 
® on the other hand, if life be ee after the introduction 
“eres Hs ... Ce: ep : See - ase a 
O ine: 
urine took place, which was saccharine. If, however, the. so- 4 
dic carbonate reaches the liver in sufficient quantity, it pre- + 
vents the production of sugar there, and of course, its appest 
* paige ky age — on N. Y. Salas p. 181, 1863. 
t Proc. Roy 
AM. eran Scr. i Sunms, VoL, XLVIII, No. 142.—Juny, 1869. 
4 
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