PREFACE 



OTTO STAPF have constantly been under requisition ; Mr I. H. 

 BURKILL, Mr C. H. WRIGHT, Mr G. MURRAY, F.R.S., and Mr 

 K E. BROWN, have given me help with the greatest readiness 

 and kindness ; other specialists to whom I have occasionally ap- 

 pealed, and never in vain, are Mr J. G. BAKER, F.R.S., Professor 

 I. B. BALFOUR, F.R.S., Mr L. BOODLE, Dr H. T. BROWN, F.R.S., 

 MrF, DARWIN, F.R.S., Mr F. ESCOMBE, Professor J. B. FARMER, 

 Mr W. B. HEMSLEY, F.R.S., Mr R. A. ROLFE, Mr E. S. SALMON, 

 Professor J. W. H. TRAIL, F.R.S., and Professor H. M. WARD, 

 F.R.S. To each and all my indebtedness for their kindness is great, 

 the value of this Glossary being largely due to their ready aid. 

 This does not exhaust the list of helpers who have kindly answered 

 single questions on special points. 



In every volume of similar character to this which I have had 

 to consult, I have found errors, sometimes numerous, occasionally 

 serious. This much larger volume offers a greater chance of 

 error, and it would be vain for me to expect to escape scathless. 

 Still I trust that comparatively few errors will be found ; some are 

 likely to be due to accidents, as that on p. 76, where " helicoid " is 

 printed " Delicoid," from the misunderstanding of a mark in the 

 press-proof; the word was correctly spelled in both proof and 



revise. 



I hope that the volume will be useful to the student and the 



expert ; to the former as supplying a concise definition, without 

 pretending to supplant the fuller information of the text-book ; to 

 the latter acting as a reminder of some obscure term, or word 

 employed in a special sense. If I have succeeded in this my aim, 

 I shall have reason to be glad at the result of nearly two years' 

 continuous labour, and may look forward at some future time to 

 improve the work. 



B. DAYDON JACKSON. 



CLAPHAM, 10#A April 1900. 



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