42 L. Kaufman: 
TABLE 2 . 
Black axolotl. 
Day of obser¬ 
vation 
Fed on 
Weight 
Behaviour of the animal 
November 
23 
meat and thyroidine 
41-7 
* 
gr. 
77 
25 
51 
55 15 
„ 
27 
11 
w n 
79 
29 
51 
71 il 
42 
77 
December 
1 
„ 
77 77 
7? 
2 
43-5 
77 
77 
4 
42-5 
» 
Gills become somewhat 
shorter. 
77 
6 
15 
77 77 
42 5 
77 
Beginning moult ; gills 
77 
8 
meat 
without thyroidine 
385 
77 
considerably shortened. 
9 
77 V 
37-7 
77 
Transferred to land. Only 
77 
10 
n 
77 77 
36 
77 
traces of gills remain. 
77 
11 
77 
77 77 
35’4 
77 
V 
12 
71 
77 77 
34-8 
;; 
m 
>> 
13 
* 
r * 
77 77 
342 
77 
Totally metamorphosed. 
n 
15 
n 
324 
77 
The loss of weight depends on the quantity of thyroidine given 
and on the animal’s state of nurture. To make comparison easy, 
I have collected in table 4 the numbers referring to the quantity 
of thyroidine given and those representing the loss of weight in 
percentages. We see that a small amount of thyroidine causes 
a little loss of weight (No. 8)t a larger amount a considerable loss 
(No. 5 and 6); on the other hand, the same quantity of thyroidine 
may cause in one case a loss of 40°/ 0 of the initial weight (No. 6), 
in another the loss of only 22%, according to the kind of nurture. 
As I did not weigh the meat, each category „scantily fed“ or 
„abundantly fed“ refers to diversely nourished specimens; that is 
why in the experiments No. 5 and 6 and No. 15 and 16 smaller 
doses of thyroidine caused a larger loss of weight among animals 
of the same category. 
During the first few days the animals fed on thyroidine do not 
exhibit any loss of weight; on the contrary, they show a certain 
ncrease. The curves 1, 2 and 3 represent the weight of axolotls 
