28 
From the above data it will be observed that the pure adrenalin 
is stronger than the synthetic dl-; on the other hand, if one chooses 
such dilutions as to make the solutions of synthetic twice as concen- 
trated (in terms of base) as the natural adrenalin, then this solu- 
tion, as shovm by the follovdng tables, is the stronger of the two 
physiologically : 
Table II. (See legend to Table I.) 
Injec- 
tion. 
! 
Base. 
Ringer. 
Time 
of 
injec- 
tion. 
Blood 
pres- 
sure 
before. 
Blood 
pres- 
sure 
after. 
Rise 
of 
blood 
pres- 
sure. 
C.c. 
Gram. 
C. c. 
P.m. 
M. m. 
M.m. 
M.m. 
Ih 
Synthetic dl-adrenalin 
1 
1 
50,000 
12. 56 
97 
181 
84 
Natural 1-adrenalin 
1 
1 
100,000 
12. 59 
98 
162 
64 
Synthetic dl-adrenalin 
1 
1 
50,000 
1.6 
93 
171 
78 
Natural 1-adrenalin 
1 
1 
100,000 
1.3 
94 
153 
59 ■“ 
Synthetic dl-adrenalin 
1 
1 
50,000 
1.12 
100 
180 
80 
Natural 1-adrenalin 
1 
1 
100,000 
1.9 
102 
155 
53 
Synthetic dl-adrenalin 
1 
1 
50,000 
3. 5 
114 
190 
76 
Natural 1-adrenalin 
1 
1 
100,000 
3.9 
110 
180 
70 
Synthetic dl-adrenalin. : 
1 
1 
50,000 
3.11 
114 
186 
62 
Natural 1-adrenalin 
1 
1 
100,000 
3.15 
118 
177 
59 
Curare 
3.22 
Synthetic dl-adrenalin 
1 
1 
50,000 
3.38 
112 
187 
75 
Natural 1-adrenalin 
1 
1 
100,000 
3.41 
115 
186 
71 
Synthetic dl-adrenalin 
1 
1 
50,000 
4.7 
122 
220 
98 
Natural 1-adrenalin 
1 
1 
100,000 
4.9 
124 
214 
90 
Synthetic dl-adrenalin 
1 
1 
50,000 
4.11 
122 
218 
96 
Natural 1-adrenalin 
1 
1 
100,000 
4. 15 
, 124 
204 
80 
S\’nthetic dl-adrenalin 
1 
1 
50,000 
4.22 
123 
• 194 
71 
Natural 1-adrenalin 
1 
1 
100,000 
4. 19 
122 
178 
56 
Synthetic dl-adrenalin 
1 
1 
50,000 
4.28 
127 
218 
91 
Natural 1-adrenalin 
1 
1 
100,000 
4.25 
124 
210 
86 
Synthetic dl-adrenalin 
1 
1 
40,000 
5. 52 
95 
213 
128 
Natural 1-adrenalin 
1 
1 
80,000 
5.49 
96 
216 
120 
Synthetic dl-adrenalin 
1 
1 
40,000 
6.3 
103 
197 
94 
Natural 1-adrenalin 
1 
1 
80,000 
6.8 
104 
194 
90 
Synthetic dl-adrenalin 
1 
1 
40,000 
6. 13 
96 
186 
90 
Natural 1-adrenalin 
i 
1 
1 
1 
80,000 
6. 12 
98 
168 
70 
If instead of the concentrations described in Tables I and II the 
ratio 2 of synthetic to 3 of natural be used, the values representing the 
rises in blood pressure from 1 c. c. more nearly approximate each 
other. It is indeed remarkable how different sets of readings agree 
with each other, how constant is the interval required for recovery 
of the vasomoter apparatus, and with what certainty one can fore- 
cast the height to which the blood pressure will ascend in response 
