534 APPENDIX. 



(37) Addition to p. 33 r >, line 20. Knohloch* instituted a series 

 of experiments upon one and the same cow in reference to the con- 

 stitution of the milk at different seasons of the year, and according 

 to the length of time during which each milking was continued. 

 From these observations it would appear in reference to the amount 

 of casein in the milk, in the first place, that its quantity is greater 

 towards the close than at the beginning of each individual act of 

 milking, whilst the quantity of water decreases ; and in the second 

 place, that the milk is poorer in casein on winter than on summer 

 fodder. In winter the amount of casein and of salts insoluble in 

 spirit rose during the milking from 7'07 to 7'08J, whilst in summer 

 it varied from 8*40 to 8'67g. 



(38) Addition to the bottom of p. 339. Moleschottt found 

 that the milk of two cows had a strongly acid reaction several days 

 before and after calving during the winter. 



(39) Addition to p. 347> 15 lines from the bottom. Dr. von 

 Becker recently made several observations in my laboratory, 

 which afforded the first experimental proof of a fact which had been 

 long assumed. In his experiments on the resorption of sugar, he 

 found, that in order to make sugar appear in the urine of 

 rabbits, whose udders contained milk, it was necessary to introduce 

 a much larger amount of that substance into the blood than in the 

 case of male or non-suckling rabbits. In these cases there was also 

 far less sugar in the blood than a comparison with other experi- 

 ments would have led us to anticipate. The grape-sugar introduced 

 into the blood, must, moreover, have been very rapidly absorbed 

 by the mammary glands in these cases. 



(40) Addition to p. 355, line 23. The ova of amphibia and 

 fishes contain the so-called yolk-plates, or tablets, which have in 

 part square, and in part other crystalline forms, and very frequently 

 present a distinctly stratified appearance. Histologists (Bergmann) 

 have long been acquainted with these bodies, and have usually 

 regarded them as fat (stearin). Virchow has recently submitted 

 them to a more exact micro-chemical examination, and has shown 



* Kunst imd Gewerbeblatt f. d. k. Bayern 1851, S. 144-147. 



t Arch. f. physiol. Heilk. Bd. 11, S. 696-698. 



M filler's Arch. 1841, S. 89. 



Zeitschr. f. wissensch. Zool. Bd. 4, S. 236-241. 



