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XVI. The Embryology of Monotremata and Marsupialia. —Part I. 
By W. H. Caldwell, M.A., Balfour Student in the University, and Fellow of 
Gonville and Caius College, Cambridge. 
Communicated by Professor M. Foster, Sec.R.S. 
Received February 22,—Read March 17,—Revised July 7, 1887. 
[Plates 29-31.] 
Introduction. 
In 1882 tlie late Professor F. M. Balfour suggested my undertaking the study of 
the development of the peculiar Australian Mammalia and Ceratodus. Tn 18S3 I 
decided to carry out this suggestion, and was elected to the travelling studentship 
founded in Balfour’s memory. 
The Committee of the Royal Society appointed to administer the Government 
Grant for the endowment of research gave me a sum of £400 for equipment. 
A Sub-committee handed on to me the sum of £100, which they had for a similar 
object obtained from the same fund. 
Through the courtesy of the President of the Royal Society, I obtained letters 
of introduction from the Colonial Office to the Governors of New South Wales, 
Victoria, and Queensland, and from the Admiralty to the Commodore of the 
Australian station. 
I arrived in Australia at the end of September, 1883, and for various reasons 
determined to make Sydney, N.S.W., my headquarters. 
I should like to take this opportunity of expressing my thanks to the Ministers of 
the Colonial Governments, especially to the Right Honourable W. Bede Dalley, of 
Sydney, and to Sir Samuel W. Griffiths, of Brisbane, for the assistance and 
facilities afforded me. The President of the Linnean Society of New South Wales, the 
Honourable William Macleay, gave me the use of a temporary laboratory, which I 
occupied until the Government gave me a more convenient set of rooms in the 
beginning of 1884. This is only one of many kindnesses for which I am indebted to 
Mr. Macleay. 
Guided by Dr. Bennett’s observations, I had intended to go after Grnithorhynchus 
immediately on my arrival, but unfortunately I wasted a fortnight trying to obtain 
MDCCCLXXXYII.—B. 1.12.87 
