118 DEVELOPMENT OF THE MONOTREMES AND CERATODUS. 
year he went to the Burnett River, in Queensland, lao the 
ceratodus is found. He had remained there since ~— time, and 
whilst he obtained there the ceratodus, he also got in the same 
district the early stages of the ornithorhynchus and the echidna 
or porcupine. 
He then said a few words about his camp. He found it was 
useless to live on the stations * far away from the river if he 
hoped to observe the ceratodi. was four months before he found 
y his 
camping on the bank of the river. His material for observation 
was obtained by an aboriginal camp, he having at one time as 
many as fifty aborigines at work for him. They got the porcupines 
for him, and some he employed searching weeds for the ceratodus. 
He proposed to describe the outlines of the embryology of a 
three main groups of animals which formed his _ of w 
in Australia, and the embryology of which w h 
of two, entirely unknown before, and in the case re marsupials 
unknown in the early stages. To make the ie clear to those 
would state with regard to his investigations were not theories 
but were facts, and were consequently not open to argument. 
Within the last few weeks he had received several letters from 
people denying that the platypus laid eggs, and they wanted him 
to argue about it. That was impossible. He stated a fact; it 
e 
a few specimens, and not with the intention of See into any 
theoretical consideration toe from these facts 
Starting with the marsupial animals, he would go on to describe 
the ceratodus and then the monotremes. Marsupials were found 
milk-givin 
dogs and cats; but the difference between the marsupials and 
the higher mammals of the old world was that the young were 
