184 Dr. S. J. Lewis. Ultra- Violet Absorption Spectra and 



and (b), or the <: amplitude " of the band, which shows considerable 

 regularity, and appears to be significant ; (d) the wave-length of the region 

 of greatest absorption in the band, that is, at the head ; (e) the wave-length 

 of the point of least absorption in the band, that is at the foot of the 

 curve in the depression. 



Table I. — Pseudo-Globulin from the Horse. 



Specimen 

 number. 



Extinction coefficient. 



Wave- 



length. 



Specific 

 rotation. 



Of head 

 at 2800. 



Of foot 

 at 2500. 



Difference 

 or amplitude. 



Head. 



Foot. 



193 



1 12 



-43 



69 



2790 



2510 





194 



1 -31 



0'52 



0-79 



2800 



2510 





197 



1-18 



0-46 



0-72 



2780 



2518 





198 



2 01 



1-41 



60 



2780 



2530 



-49 -50 



199 



1 -29 



0-57 



0-72 



2800 



2540 



- 52 -06 



203 



118 



0-46 



0-72 



2790 



2500 



-52 17 



Adopted 



1 -19 



0-47 



72 



2790 



2520 



-52 



Table II. — Pseudo-Globulin (Human). 



Specimen 

 number. 



Extinction coefficient. 



Wave-length. 



Specific 

 rotation. 



Of head 

 at 2800. 



Of foot 

 at 2500. 



Difference 

 or amplitude. 



Head. 



Eoot. 



200 ascitic fluid 



1 -26 



61 



0-65 



2750 



2520 







201 „ „ 



1 -35 



0-63 



0-72 



2780 



2528 



(a) -43 26 















(b) -43-82 



202 „ „ 



1-46 



0-72 



0-74 



2790 



2520 



-46-97 



204 „ 



1 -40 



0-67 



0-73 



2805 



2525 



-47 -66 



205 normal serum 



1 -28 



-58 



0-70 



2790 



2520 



-45 -35 



Adopted 



1-35 



0-63 



72 



2790 



2521 



-46 



Observations on the Figures for Pseudo- globulin, Tables I and II. 



Omitting the earlier numbers, 193 and 194, which represent the first 

 efforts, and 200, which was not a very good specimen, the figures exhibit a 

 remarkable regularity in the amplitude of the absorption curve as expressed 

 by the difference in the extinction coefficients. With one exception 

 (No. 198), they all lie between 0-70 and 0-74. Very little difference 

 between the horse and human specimens is evident. The chief distinction 

 is that the corresponding coefficients are a little higher for the human than 

 for the horse. 



