HOW THE SMOKER’S HEART IS AFFECTED 483 
the instrument, as follows : No. I, immediately before smok¬ 
ing; No. II, during the indulgence of the habit, and No. 
HI, fifteen minutes later, after the effect of the narcotic 
had become apparent. 
Now, by reference to Fig¬ 
ure 422, No. Ill, we may 
observe how this young 
man’s heart should record 
itself, for the latter is the 
tracing of the heart pulsa¬ 
tions of a normal young 
man of the same age and 
temperament. Nos. IV to 
VI (Figure 421) are repre¬ 
sentative of another in¬ 
haler twenty years old, 
who began the practice at thirteen. He now uses a strong 
pipe. 
In Figure 422, Nos. I and II, taken respectively before 
and after smoking, are tracings of a sensitive youth of eight¬ 
een who has been smok¬ 
ing only two years. Ob¬ 
serve the skip of his heart 
beat at x and the cor¬ 
responding partial skip 
under the stimulus of 
smoking in No. II. No. 
Ill (Figure 422), as men¬ 
tioned above, is a trac¬ 
ing of a strong healthy 
heart of a young man of 
somewhat excitable tem¬ 
perament. No. IV represents the phlegmatic temperament, 
that is, a person who is not excitable. No. V is the heart 
tracing of a strong and healthy young woman. 
