ADDITIONS AND NOTES TO VOL. II. 533 



upon the amount of sugar contained in the blood, will, I believe, 

 afford an average estimate of the quantity of blood in animals : if we 

 know how much sugar the blood may under the most favourable 

 conditions contain, without its appearing in the urine, and if we 

 determine how much sugar the blood may normally contain on an 

 ordinary diet, we may be able to calculate the quantity of blood 

 contained in an animal by ascertaining the quantity of sugar which 

 must be introduced by injection into the jugular veins, or by some 

 other method, in order to make it pass into the urine. We know 

 from von Becker's investigations (see p. 529 of this volume) that 

 about 0*5$ of sugar may exist in the blood without passing into 

 the urine, and that further, after the use of saccharine roots the 

 blood contains 0'67 of sugar. Now I find from my own, as well 

 as from Uhle and von Becker's injections of sugar (grape-sugar), 

 that when 0*2 of a gramme of sugar was injected into the blood of 

 rabbits of the ordinary size (1200 grammes' weight), the urine indi- 

 cated the presence of sugar in 25 minutes. If now we assume that 

 in a rabbit weighing 1 kilogramme, 0*15 of a gramme of sugar 

 injected into the blood will saturate it to such an extent, that if 

 there were any additional quantity of sugar it would appear in the 

 urine, a rabbit of this weight will contain 95*8 grammes of blood. 

 Dr. von Becker is still engaged on experiments of this kind. In 

 the present uncertainty of all the methods for determining the 

 amount of blood in the animal body, a method like the above 

 should not be wholly overlooked, although it may not present any 

 great guarantee for its accuracy : since the agreement of the results 

 of different methods would increase the degree of probability for 

 the determination of the definite amount of blood contained in 

 individual organisms. 



(36) Addition to p. 303, line 18. Bidder* believes, from his 

 experiments on animals, that in an adult man about 13 kilo- 

 grammes [about 28'6lbs.] pass in the course of 24 hours from the 

 thoracic duct into the subclavian vein. He is of opinion that only 

 3 kilogrammes Q>'6 Ibs.] are true chyle (or digested nutrient matter), 

 and that 10 kilogrammes [22 Ibs.] are true lymph. Hence in the 

 course of 24 hours a quantity of lymph, averaging from l-8th to 

 l-7th of the weight of the body is formed and poured into the 

 blood. 



* Verdauungssafte und S offwedisel. S. 285. 



