Metamorphosis of Axolotls 
75 
Fig 1 . 4. Dissection of skin of an axolotl undergoing metamorphosis; b. v. =3 
blood-vessels; v. g. — venomous gland. 114 times magnified. 
Fig. 5. Diaseetion of a gill-filament of a normally fed axolotl. 144 times 
magnified. 
Fig. 6. Dissection of a gill-filament of a larva fed four times during 11 days 
on meat with 025 gr. thyroidine. Same magnification as in fig. .6. 
Fig. 7. Dissection of the wall of a large blood-vessel and of the epithelium 
of the gill-filament of a normally fed axolotl. 1050 times magnified. 
Fig. 8. Dissection of the wall of a large blood-vessel and of the epithelium 
of the gill-filament of a larva fed four times during 11 days on meat with 025 gr. 
thyroidine. Same magnification as in fig. 7. 
Fig. 9. Dissection of the tail end of an axolotl. 
Fig. 10. Dissection of the tail end of a specimen fed on thyroidine. Same 
magnification as in fig. 9. 
Fig. 11. Lower jaw of an axolotl undergoing metamorphosis. The skirl and 
the mylohyoidei muscles are cut asunder. Thyr. — thyroid gland; m. h. = mylohyoid 
muscle; g. h. == geniohyoid muscle; st. h. — sternohyoid muscle. About 2 times 
magnified. 
Table 2. 
Phot. 1. A black Amblystoma. 
Phot. 2. An albinotic Amblystoma. 
Phot. 3. Dissection of the thyroid gland of a normally fed axolotl. 
Phot. 4. Dissection of the thyroid gland of an animal undergoing transform¬ 
ation under the influence of thyroidine. Same magnification as in phot. 3. 
Phot. 5. Transversal dissection of the wall of a larval intestine. 
Phot. 6. Transversal dissection of the wall of the intestine of a specimen fed 
on thyroidine. Same magnification as in phot. 5. 
Phot. 7. Transversal dissection of a fold of the intestine of a normally fed 
larva. 
Phot. 8. Transversal dissection of a fold of the intestine of an axolotl fod 
on thyroidine. Same magnification as in phot. 7. 
