ot 
Summary. 
Average All Sixteen Organisms. 
Land B Na. asp. NHsNO; Starch NHsNO;3 and 
agar. agar. agar. agar. Starch Agar. 
DRO aVSe ees. 2.94 TS Si 3.69 3.16 2.97 
HMOAVSs seo. toss 2.50 1.81 3.76 3.00 a), PAS) 
MPS GLAVS wis cone an 2.56 2.50 4.31 3.06 2.90 
Summary. 
Average Organisms 6 to 16 Inc. 
Land B Na. asp. NHsNOs3 Starch NHiNO;3 and 
agar. agar. agar. agar. Starch Agar. 
IP CLAVIS:., istiese et Pe AICO) OE KC) 3.91 3.00 3.10 
7 Ceanisanlee aoe 1.64 2.00 3.82 3.18 3.18 
GSC EINE aero heen 3.00 4.55 3.09 Dey 
Noles. 
(1) The comparisons between the growth of an organism on the different 
media were practically as marked at 5 days as they were at 15. 
(2) The five molds Nos. 1, 2, 3, 4, 5, were more easily transferred to 
sodium asparaginate agar than to some of the media. 
(3) Where molds are included the greatest number of failures of growth 
oceurred on Lipman and Brown agar. 
(4) Studying Nos. 6 to 16 inclusive, it was found that the Lipman and 
Brown and the Sodium asparaginate agar were about alike in amount of 
growths produced on slants, and that the ammonium nitrate agar was the 
poorest media considered. 
(5) When chromogenesis is considered, Starch alone and in combination 
with the Ammonium nitrate brought out as much chromogenesis as the 
Lipman and Brown agar. 
Summary of Investigation. 
This paper gives the results of tests made on agar slants where the two 
media most commonly used for plating soils are compared. The results 
