58 

 There is in 1,000 parts of fresli muscle of the — 



Part 

 magnesium. 



Dog ...'. 0.2370 



Hog ..-- 2823 



Deer 2906 



Cat 2863 



Man 2116 



Average 2611 



while there is iii 1,000 parts of fresh muscle of the — 



Part 

 magnesium. 



Frog 0.2353 



Shad' 1670 



Eel .1782 



Average 1935 



A comparison of the averages shows for the — 



Muscles of mammalia 



Muscles of frogs and fish 



Liver of mammalia 



Calcium. 



Magne- 

 sium. 



Calcium. 



Magne- 

 sium. 



1 



3.23 



or 0. 31 



1 



1 



. 75 



or 1.33 



: 1 



1 



.04 



or 25.00 



1 



Since it is seen that glands contain more calcium than muscles, and 

 that the muscles of lower animals contain more calcium tban those of 

 the higher animals, one can not help seeking for a law underlying these 

 facts, which are in full accord with the writer's inference that the 

 amountoflime must increase with that of the nuclear 

 mass. On the other hand the high lecithin content of the brain may 

 have a connection with the relative increase of magnesia in it (p. 50.) 



It would be very interesting to analyze the gray and the white sub- 

 stances of the brain separately, as they show a great quantitative differ- 

 ence in the nuclear masses. Moreover, the peripheral nerve threads 

 being poorest in nuclear mass, should also be investigated in thisrespect- 

 It is regrettable that so far no physiologist has undertaken the work.^ 



BEHAVIOR OF AXniALS TO STROXTimi SALTS AND OXALATES. 



The replacement of calcium salts by strontium salts is just as impos- 

 sible in animals as in plants (p. 39). l!^ot even in the formation of the 

 bones can strontium phosphate take the place of calcium phosphate* 

 Craemer fed a rapidly growing young dog for several months with food 

 poor in lime, and to which an addition of strontinm phosphate was made, 

 and as a result great softness of the bones and rhachi^ic alterations 

 were soon obvious. Weiske'^ arrived at the same conclusions and 

 refuted the contrary opinions of Papillion and Konig. In the presence 



1 The unusually large proportion, 0. 3102 part, found by Katz in the pike, may 

 possibly be due to an error. 



"' The gray substance of the brain is richer in nuclear mass than the white substance 

 and therefore ought to contain more lime. 



^Zeitsch. f. Biol., Vol. XIII, p. 121. 



