NOTES TO VOL. III. 559 



The last section of von Bibra's Memoir pertains rather to 

 Anatomy than to Chemistry, and therefore requires no notice in 

 the present place. G. E. D.] 



(2) Note to p. 334, line 21. [Dr. Reuling* has recently pub- 

 lished a prize essay on the amount of ammonia in the expired air 

 both in health and in disease, with especial reference to ureemia. 

 The following are his most important conclusions : 



1. The exhaled air of every one contains ammonia. 



2. In health its quantity depends on the amount of ammonia 

 in the inspired air. 



3. In healthy men there is neither an absorption nor an 

 elimination of ammonia by the pulmonary mucous membrane. 



4. Fresh normal human blood contains no ammonia ; but 

 almost immediately after it has ceased to circulate in the vessels 

 (whether obtained by venesection or from the dead body), car- 

 bonate of ammonia and other ammoniacal compounds begin to be 

 formed in it. 



5. Logwood paper is the most sensitive of all the tests for 

 ammonia, and detects it when diluted 64 million times. 



6. The amount of ammonia in the expired air is sometimes 

 increased in the following diseases : In caries of the teeth, in 

 angina tonsillaris, in typhus (in consequence of the formation of 

 ammonia in the blood), in pyaemia (when ammonia is formed in 

 the blood through the influence of pus), and in uraemia (either 

 when ammonia is developed in the blood from the retained urea, 

 or when the ammonia formed in the bladder from urea is taken up 

 into the blood). 



7. In all probability the amount of ammonia in the expired air 

 is sometimes also increased in cholera and scarlatina. 



8. The augmentation of the quantity of ammonia in the 

 expired air occurs most frequently in ureemia, but is not a 

 pathognomonic symptom of this disease. 



9. The appearance of ammonia in the blood is certainly the 

 most frequent, although it is not the sole cause of uraemia. 

 Uraemia may be produced by the accumulation of the extractive 

 matters in the blood in cases of suppression of urine. G. E. D.] 



(3) Note to p. 381, line 11, [Dr. Malcolm f has just published 



* Ueber den Ammoniakgehalt der expirirten Luft, und seiner Yerlialten in 

 Ki ankheiten. Ein Beitrag zur Kenntniss der Ursmnie. Giessen, 1854. 

 t Dublin Quarterly Journal of Medical Science. Vol. 18, p. 320. 



