ABSTRACT OF PROCEEDINGS. XXi, 
2. “ On Vitis opaca, F.v.M., and its Enlarged Rootstock,”’ 
by RICHARD T. BAKER, F.L.S., Curator, and HENRY 
G. SMITH, F.C.S., Assistant Ourator, Technological 
Museum, Sydney. 
Remarks were made by Mr. J. H. MAIDEN, Dr. R. GREIG 
SmiTH, Mr. J. A. SCHOFIELD, Mr. F. B. GuTuHrin, Dr. F. 
H. QUAIFE, and the Chairman. Mr. BAKER replied. 
3. “Investigation of the Disease in Cattle known as 
‘Rickets,’ or ‘ Wobbles,’ and examination of the 
Poisonous Principle of the Zamia Palm (Macrozamia 
Fraseri),’’ by H. A. MANN, Government Analyst and 
Chemist to the Department of Agriculture, W.A., and 
T. I. WALLAS, Acting Physiologist and Pathologist to 
the Department. Preliminary notice. (Communicated 
by R. GREIG SMITH, D.SC., etc.) 
‘* For some time we have been carrying on investigations 
on the above subject, as the result of which we have come 
to the conclusion that the effects upon cattle induced by 
eating the Macrozamia Fraseri, are caused by the presence 
in the plant of acid potassium oxalate (‘‘ Salts of Sorrel.’’) 
This is a confirmation of the results of an analysis made by 
a Mr. Norrie prior to 1876, and reported to the Royal 
Society of New South Wales by F. Milford, M.p. (Journal 
of the Soc., Vol. x., p. 295.) This analysis, which was 
made on another species (Macrozamia spiralis) appears 
to have been overlooked by chemists making subsequent 
examinations of the plant, and we have been unable to 
find any indication that the presence of oxalates was 
associated by other investigators with the observed effects. 
We hope to beable to submit a full report of our experi- 
ments, which are now approaching completion, at an early 
date.”’ 
Remarks were made by Mr. J. H. MAIDEN, Prof. LIVER- 
SIDGE, Mr. F. B. GUTHRIE, and the President. Dr. GREIG 
SMITH replied. 
