ON THE SECRETION OF SALIVA. 
125 
2.0 
to 
2 . 11 |. 
IV. Stimulate chorda 1|, 1|-, 1|, and ^ min., that is for 5 min.; there were considerable 
variations in the rate of secretion. Saliva collected = 2'6 c.c. 
2.14 
to 
2 . 22 . 
I Clamp trachea tubes aud stimulate chorda (3 times) to obtain saliva during dyspnoea, as 
I in collecting (II.). Saliva not collected. 
2.24 V. Clamp ti’achea tube. 
2.244. Stimulate chorda for l^- min., then unclamp trachea tube. 
2.30 ) Above repeated four times. Chorda stimulated 14, 1, Ij, and 1^ min. Total time secre- 
2.50. J tion 6J min. Saliva collected 3 c.c. 
2.51 1 
to VChorda occasionally stimulated; 21 drops thrown away. 
3.9. J 
3.13 I 
to Stimulate chorda 14, 1|-, li, and 4 min., = 5 min. Saliva collected = 3 2 c.c. 
3.30. J 
Trachea tubes clamped for 2 min.; no spontaneous secretion. 
Time of 
beginning stimu¬ 
lation chorda 
c = 7. 
Number c.c. 
of saliva 
collected. 
Rate of flow of 
saliva per 
minute in c.c. 
Percentage 
organic 
substance. 
Percentage of 
salts. 
Remarks. 
I. 
12.0 
2-0 
•83 
1-827 
•654 
11 . 
12.12 
2-5 
•356 
2-102 
•657 
Dyspnoea. 
III. 
12..36 
2-0 
•348 
1-669 
•556 
IV. 
2.0 
2-6 
•52 
•784 
•515 
V. 
2.24 
3-0 
•44 
•760 
■651 
Dyspnoea. 
VI. 
.3.13 
3-2 
•64 
•627 
•522 
The rates of flow given for II. to VI. are all a little too high, since the duration of stimulation is here 
taken as the duration of secretion of saliva. There was usually a secretion of something less than a 
drop of saliva after the end of each stimulation. 
Ill this experiment dyspnoea produces more marked effects; it reduces the rate of 
secretion of all the constituents of saliva, and presumably by decreasing the irritability 
of the gland-cells. But its effect on the various constituents of saliva is unequal; it 
reduces the rate of secretion of water most, and in consequence the percentage com¬ 
position of the saliva is altered. 
Saliva II., collected during dyspnoea, is secreted at less than half the rate of 
saliva 1., but it has nevertheless an equal percentage of salts, and about H per cent, 
more salts than saliva III., secreted at nearly the same rate. So, also, saliva Y., 
collected during dyspnoea, although secreted distinctly more slowly than salivas lY. 
and YL, before and after it, has ’13 to ’14 per cent, more salts. 
With regard to the percentage of organic substance, it is in the first case of dyspnoea 
increased, and in the second decreased, but less than it would otherwise have been. 
