120 
MESSRS. J. N. LANGLEY AND H. M. FLETCHER 
Table Y. 
Rate of secretion per 
minute in c.c. 
Percentage of 
salts. 
Y. 
•370 
•679 about* 
III. 
•208 
•704 
II. 
•175 
•726 
lY. 
•136 
•711 
It will be observed tbat the experimental errors are such as to make the contrast less striking, for, by 
admixture of some saliva II. with saliva III., the percentage of salts in III. is too high; and by 
admixture of saliva III. with saliva IV., the percentage of salts in lY. is too low. 
Experiment 4. 
August 10, 1887.—Rather small Dog. 
11.45. Stimulate chorda, c = 16 to c = 13, no secretion ; c = 12, rapid secretion. 
12.5. Collect I. Stimulate chorda for 30 sec. in each minute, c = 12. Number of drops in each 
30 sec. of stimulation were 
4.4.4.2.7.3.5.5.4 = 2-7 c.c. 
There was a seci’etion of about half a drop, lasting about 15 sec. after the end of each 
stimulation, so that 2’3 c.c. were secreted in the 4| min. of stimulation, and '4 c.c. in 
2 j min. after the stimulation had ceased. 
12.25. Inject 1 c.c. '1 p.c. atropin sulphate into jugular vein. 
12.40. Stimulation of the choi’da, c = 12 to c = 3, gives no secretion or a mere trace. 
Stimulate sympathetic; 7 droj)s of saliva thrown away. 
1.33. Collect II. Stimulate sympathetic as a rule for 30 sec. in each minute, c = 8. There is 
a slow secretion which usually continues for 15 or more sec. afterwards. In 139 min., 
the sympathetic being stimulated altogether for 56 min., 2 Jc.c. of saliva are collected. 
This gives the rate of secretion as '036 c.c. per minute; but, as the saliva continued to 
flow in the intervals of stimulation, the rate was really slower than this. 
4.0. Stimulate chorda, secretion slow, 2 to 3 drops a minute ; the amount is proportional to the 
length of the intervals of rest. 
4.6. Collect III. Stimulate chorda, c = 8 in alternate 15 sec. for 6f min., then c = 8 to c = 6 
for 15 sec. in each 45 sec. for 21 min. i.e., total time of stimulation was 13| min. out 
of 34 min., 2'5 c.c. of saliva were collected; reckoning the time of stimulation only, the 
rate of secretion is '185 c.c. a minute. This, of course, is a little too high. 
4.47. Inject 1'5 c.c. ’5 p.c. pilocarpin. Twelve drops thrown away. 
4.50. Collect lY. There were 4 drops every 30 sec. for 4 min. ; then 3 drops every 30 sec. for 
44 min. 
4.59. Collect Y. Drops in each 30 sec., were 
3.3.3.2.2.2.2.2.2.2.2.1.1.2.1.2.1.1.2.2.1.1.2.1.2.1.1.2.1.1.2.1. 
5.161-. Inject 1‘25 c.c. ’5 p.c. pilocarpin. About 3| c.c. secreted, then stimulate chorda. Ten drops 
thrown away. 
5.32. Collect YI. Stimulate chorda c = 8 in alternate 30 sec., very little effect on secretion, 
increasing’, perhaps, the continuous secretion by 4 a drop a minute during the earlier 
period of collecting ; secretion begins 4 and ends 24 drops a minute. 
* Gf. note p. 119. 
