Template:Windle1940 table4

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Table 4 **The Relationships Calculated from Electrocardiograms of the Chick**
Age	Length of heart (mm)	Heart rate (/min)	P-R interval (sec)	Duration of R rise (sec)	Duration of R-T complex (sec)	Approximate conduction speed (mm/sec)
40 hr. embryo	0.8	120	none	.009-.012	0.28-0.82	2.67
60 hr. embryo	1.2	163	0.11	.008-.010	0.20-0.21	3.80
120 hr. embryo	2.0	230	0.09	.010	0.21-0.24	6.85
5 day chick	14.0	295	0.06	.004-.006	0.24-0.33	40.58
Adult hen	40.0	320	0.06	.009	0.15-0.18	117.77