during incubation in the common fowl. 
351 
Plate XXXIV. 
Fig. 1. An egg, opened 16 hours after incubation. Natural 
size. 
Fig. 2. A small portion of the yelk, with the embryo and 
areola lying on its bare surface, and the external membrane 
of the yelk entirely removed. Magnified 5 diameters. 
Fig. 3. The same embryo, and a portion of the areola laid 
on a black ground. Magnified 10 diameters. 
Fig. 4. An egg, opened 24 hours after incubation. Natural 
size. 
Fig. 5. A small portion of the yelk, with the embryo and 
areola lying on its surface, and the external membrane of the 
yelk entirely removed. Magnified 5 diameters. 
Fig. 6. The same embryo, and a portion of the areola laid 
on a black ground. Magnified 10 diameters. 
Fig. 7. An egg, opened g6 hours after incubation. Natural 
size. 
Fig. 8. A small portion of the yelk, with the embryo and 
areola lying on its surface, and the external membrane of the 
yelk removed. Magnified 5 diameters. 
Fig. 9. The same embryo, and a portion of the areola laid 
on a black ground. Magnified 10 diameters. 
Plate XXXV. 
Fig. 1. An egg, opened two days and twelve hours after incu- 
bation. Natural size. 
Fig. 2. A portion of the yelk, with the embryo lying in its 
natural position in the centre of the vascular areola, and the 
external membrane of the yelk removed. Magnified 6 di- 
ameters. 
