3J8 



and Delft are absolutely certain, still I believe that the probability 

 is not small, that the difference between the assumed and the real 

 coefficients of expansion of the prototype at Bi'eteuil and the 

 metre N". 27, is for the greater part the cause of the value of 

 LL. It remains absolutely uncertain, what the real coefficients of 

 expansion of the metres are and also whether the coefficient of N". 27, 

 determined after F'izeau's method, merits greater or less confidence 

 than that of the prototype deduced, as 1 believe, from direct measure- 

 ments at different temperatures. But whatever it may be, it is of great 

 importance, and it is in my opinion the chief result which may 

 be deduced from my discussion, that when a direct comparison 

 of the metre W. 27 and the intei-national metre shall be made, 

 according to the right given to our government, it will not be confined 

 to a comparison at a mean temperature, but that if possible, the 

 absolute coefficient of expansion of our metre, and certainly the 

 difference in expansion of N". 27 and the prototype will also be 

 determined. 



Lenk [Sioitzerland^. 



Physiology. — "On the formation of antibodies after injection of 

 sensitized antigens." II. By Dr. L. K. Wolff. (Communicated 

 by Prof. C. Èykman.) 



1. As a continuation to my series of experiments given in the first 

 communication, I have examined the immunisation power of a mixture 

 of erythrocytes and specific serum with a snrplus of amboceptor. 



It is generally stated in literatni-e that this power is very slight or 

 that it does not exist at all ; in my two series of experiments I have also 

 found very little or no formation of amboceptor. I shall communi- 

 cate one of the series. 



Horsecorpuscles — specific rabbitserum ^'^oo strong. 



Binding power of 1 c.cm. 5 % blood ± 7 doses. 



Mixture of 40 c.cm. serum and 20 c.cm. undiluted blood i. e. 

 20 doses amboceptor, so a great surplus. 



Rabbit 149, 73 aiid 76 each get 20 c.cm. of the mixture intraperitoneal. 

 „ 179, 70 and 71 „ „ 67, „ undiluted blood oidy 



