TRANSACTIONS OF SECTION 1. 



'21 



of nitrogen excreted daily was liable to variation. The present writer was himself 

 the subject of the investigation: height, 5 feet 9| inches; weight, 149 lb.; age, 

 twenty-two. 



The day's urine was collected and its volume measured. Five c.c. were analysed 

 by the Kjeldahl-Qunuiug method, the ammonia being collected in 50 c.c. of stan- 

 dard hydrochloric acid. The residual acid was determined by a decinormal 

 baryta solution, the latter being standardised by potassium quadroxalate. 

 Litmus was the indicator used. The analysis was in every case done in duplicate, 

 and the two results generally agreed within less than 05 per cent, of the total 

 nitrogen. Several blank determinations were made with the materials used for 

 the analyses, and a small correction was made for the amount of alkali obtained in 

 these blank experiments. The apparatus for distilling the ammonia was first of 

 all tested by driving oft" the ammonia from a standard ammonium chloride solu- 

 tion. The amount of ammonia thus obtained agreed satisfactorily (within 0*2 per 

 cent.) with the known strength of the solution. 



The subject of the investigation lived during the period of the determinations 

 as far as possible upon similar daily amounts of food. The diet was of the 

 familiar type, varying in character from day to day. That of three successive 

 days was weighed, and the amount of contained proteid was calculated from 

 Vierordt's Tables. The total proteid in the day's food on July 27 was 122-8 

 grammes; this contains 19 grammes of nitrogen, and, allowing a reduction of 

 12 per cent, for unabsorbed nitrogen, the amount of absorbed nitrogen is 167 

 grammes. The actual excretion of nitrogen on this day was 16"9 grammes. The 

 calculation of total proteid on July 26 gave a food intake of 94 grammes, and on 

 July 28 a food intake of 95 grammes. 



5. Report on the Effect of Climate upon Health and Disease. 

 See Eeports, p. 424. 



6. Second Interim Report on the Ductless Glands. — See Reports, p. 423, 



1906. 



3 a 



