— 95 — 



Sie werden begreifen, dass es mir daran liegt, zu erfahren, 

 ob jene bestimmten Integralformeln schon bekannt sind, und 

 Sie würden mich sehr verpflichten, wenn Sie mir hierüber ge- 

 fälligst antworten wollten. 



In der Hoffnung, Sie werden mir auch Gelegenheit bieten, 

 Ihnen einen Dienst zu erweisen, und die Perioden der Inter- 

 mittenz unsers schriftlichen Verkehrs werden fortan etwas 

 kürzer sein, habe ich die Ehre zu sein, Ihr ergebenster 



Cayley an Schläfli. 



Dear sir, 

 I have to thank you very nmch for the two papers and 

 to apologise for having been so long in writing to acknowledge 

 the receipt of them. The one on Bernoullis numbers"-^) will be 

 very acceptable for the Q. M. Journal, the other one is as you 

 observe rather long, and as I should be very unwilling to 

 adopt the course you suggest of merely printing the first section 

 of it. I should be glad to know whether you will instead, 

 allow me to present it for you to the Royal Society, with a 

 view to its publication in the Phil. Transactions;^^^) will you allow 

 me to make such alterations as seem necessary in the phraseo- 

 logy of some of the sentences. I would have further studied 

 the paper and have send you any remarks which occurred to 

 me upon it but I did not wish any longer to delay writing; 

 you do not I think notice a special form of the ruled surface 

 mentioned in Mr. Salmons book, for which the two directrices 



-'■»j On Staudt's Proposition to the Bernoullian Numbers, By Pro- 

 fessor Schlaefli. Quarterly Journal, Vol. VI, p. 75—75. (See Crelle's Journal 

 Vol. XXI, p. 372.) 



30) On the distribution of surfaces of the third order into species 

 in reference to the absence or presence of singuLar points and the reality 

 of their Hnes. Communicated by Arthur Cayley, F. R. S. 48 S., 4". 



Philosophical Transactions of the Royal Society of London 1863. 



