205 
Harry Lewis Wieman 
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F. AAS ISS REE 
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Beri wen Gord 
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Kies. 9 ro 17. 
The accompanying figures are camera lucida drawings made at table level 
In all cases the magnification is about 2000 diameters, 
Fig. 9. Longitudinal section, 120-130-hour stage. 
Fie. 10. Cross section, 120-130-hour stage. 
Fias. 11 and 12. Longitudinal sections, 130-140-hour stage. 
Fics. 13 and 14. Cross sections, 130-140-hour stage. 
Longitudinal section of two adjacent fibril bundles of adult tissue. 
Hie. 15; 
Fic. 16. Longitudinal section through the reticular structure found in the 
center of the adult cell. 
Fig. 17. Cross section of the adult heart muscle cell. 
