85- 



temperature variation. By plotting a curve of the sub-tangent of the viscositv- 

 temperature curve against the temperature, a subsidiary curve was formed which 

 should, in all the types of formula proposed, be a straight line, but which turned 

 out to be a parabola. On determining the constants of the parabolic equation 

 and integrating this to obtain the equation of the viscosity-temperature curve, 

 a formula was deduced which represented the experimental results to within the 

 limits of experimental accuracy. This formula was an exponential one, the 

 exponent being the inverse tangent of a linear function of the t<;mperature. 

 Reasons were given for believing that this would represent the temperature 

 variation of the viscosit}^ of any liquid. 



The Effect of Grape-Sugar Upon the Composition of Certain Fat- 

 Producing Bacteria. By Robert E. Lyons. 



It has been observed by Dr. E. Cramer ■■ and others! in studies upon the com- 

 position of bacteria, that the same micro-organism grown upon Peptom and 

 Grape-sugar A gar- Agar produces in each case different quantities of nitrogenous 

 substances and matter which is soluble in alcohol and ether. 



In this same direction DucleauxJ demonstrated that yeast cells grown upon 

 a material containing grape-sugar produced fat, while the same yeast grown upon 

 pure nitrogenous material did not produce fat. 



To study how grape-sugar affects the quantities formed of nitrogen, ash, fat 

 and matter to be extracted by means of alcohol and ether, three varieties of cap- 

 sule bacilli were selected : 



Pfeiffers' Capsule Bacillus. 



!i Fadenziehender Capsule Bacillus. 



li No. 28 Capsule Bacillus. 



'•'Dr. E. Cramer— " Zusammensetzung der Baeterien in ihrer AbhUngigkeit voii clem 

 Nahrmaterial." Arch, fur Hygiene— i6, 151-191. 



t Tayosaka-Nishimura— " Zusammensetzung eineis Wasserbacillus."' Arch.fiir Hygiene 



IS, 318-333. 



t Ducleaux— " Sur la nutrition interacellulaive." Ann. de I'lnstitute Pasteur— 1889 Nc 

 8, p. 413. 



II Fadenziehender and No. 28 are forms from the water of the River Lahn, near Mos- 

 bourg. 



