506 PROFESSOR TAIT ON KNOTS. 



reduce by one the number of the distinct 10 fold types which was originally 

 given in my paper. I hope in time to make a full comparison of the two 

 versions of the census. Meanwhile I may note that there is one omission, 

 and also one duplicate, in Class VI. of Mr Little's version. This duplicate 

 has led him to insert one type too many. 



More than a month ago I received from Mr Kirkman the full polyhedral 

 data for the census of 11 folds, which I hope soon to undertake. The number 

 of forms is so great, and the time I can spare for the work so limited, that I 

 cannot promise it at an early date. 



