Boyer. — Mesoderm in Teleosts. 
Fig. 4. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 84. 
PLATE L 
Clove-oil preparation of a blastoderm, shortly before the closure of the 
blastopore, 46 hours after fertilization of the ovum. Perenyi’s fluid. 
Czokor’s alum cochineal. X 45. 
Clove-oil preparation of an embryo of 52 hours, soon after the closure of 
the blastopore. ‘The optic vesicles are prominent, but the auditory 
vesicles have not yet been formed. Perenyi’s fluid. Czokor’s alum 
cochineal. > 48. 
Clove-oil preparation of an embryo of 90 hours. Perenyi’s fluid. Czokor’s 
cochineal. X 42. 
Clove-oil preparation of an embryo of about 23 days. Kleinenberg’s picro- 
sulphuric mixture. Czokor’s ccchineal. XX 42. 
Transverse section through the pectoral region, at a point indicated by 
the figure 5 in Fig. 1. From an embryo of 46 hours, showing thie 
condition of the primitive layers soon after the closure of the blasto- 
pore. Perenyi’s fluid. Kleinenberg’s hematoxylin. Section is 744 
in thickness. > 310. 
Transverse section from the pectoral region, indicated by the figure 6 in 
Fig. 2. From an embryo of 52 hours. Perenyi’s fluid. Kleinenberg’s 
hematoxylin. Section 74in thickness. X 310. 
Sagittal section through the parietal plates, taken from the left side of an 
embryo of 56 hours and a little more advanced than Fig. 2. See- 
tion 10 in thickness. Perenyi’s fluid. Kleinenberg’s hamatoxy- 
lin. X 66. 
Sagittal section through the protovertebral region of the same embryo as 
igen <00- 
Frontal section through the protovertebral region of an embryo a little 
more advanced than that of Fig. 3. Perenyi’s fluid. Kieinenberg’s 
hematoxylin. > 168. 
