( 3G9 ) 



taken nine days at a strelcli till Oct. the 4'''. On September the 29^^' 

 exercises were pei-formed with Sandow's implements for 27, hours with 

 short intervals. On October the 2"^ excessive labour was done, 

 consisting of a walk of 21 KM. in the morning from 9 till 12 

 o'clock, a walk of 10 K.M. in two hours in the afternoon and wor- 

 king with halters for 7a hour in the evening. On the six days of 

 rest between September the 27''» and Oct. the 4'^ (on the first day 

 Sept. the 26^'» the urine was not examined) there was excreted on 

 the average every day : 



V. H. J. 859 (max. 1.977, min. 1.755) gr. creatinin 

 V. 1.925 ( „ 2.047, „ 1.860) „ 

 while on Sept. the 29'^^ there was found : 



V. H. 2,00J V. 1.979, gr. creatinin 

 On October 2"^ „ 1.859 „ 1,945, „ 



That not too much importance for the intluence of muscular labour 

 on the secretion of creatinin must be attached to the somewhat liigh 

 figure of V. H. on September the 29^^ becomes clear when the sepa- 

 rate portions of that day are considered. In the first portion of 

 that day, that is in the urine excreted in the morning between 8 and 

 12 o'clock, so before muscular exertion was begun, 0,404 gr. creatinin 

 was already found to 0,331 gr. and 0,345 gr. in the corresponding 

 portions of the preceding and the following day. 



After ordinary food had been taken for nine days, food was taken 

 in absolutely insutTicient quantity for fi\'e days at a stretch, con- 

 sisting of bread, potatoes, butter and cheese. It contained : 

 for V. H. 36.6 gr. proteid 43 gr. fat 186 gr. carbohydrate; 15 Gal p. Kg. 

 „ V. 29.7 „ „ 34.7 „ „ 158 „ „ ; 15 „ „ „ 



On Oct. the 16^'» a bicycle ride of 42 K.M. in 2\', hours was 

 undertaken in the morning. In the first hour 20 K.M. were done 

 but after that they could progress but slowly from hunger and fatigue. 



In the afternoon a walk of 16 K.M. was taken from 2 till 5 

 o'clock and afterwards in the evening they w^orked with halters. The 

 result was that both felt still very tired the next day. 



The calculation of the average has no value in this short experi- 

 ment. The course of the excretion of the creatinin was as followed : 



Proceedings Royal Acad. Amsterdam. Vol. VIII. 



