352 



Journal of Agricultural Research 



Vol. IV. No. 4 



Table II. — Comparative counts obtained -with modified standard and standard aeroscopes 



set up in tandem 



CONNECTIONS NOT SEALED. DUPLICATE PLATING 



Test No. 



I 



2 



3 



4 



5 



6 



7 



8 



9 



lO 



II 



12 



13 



14 



15 



16 



Average 



Modified standard aeroscope. 



Plate count 

 in first tube. 



536 

 175 

 234 

 32 

 54 

 289 



165 

 81 



258 

 288 



174 



581 



443 



64 



51 

 140 



217 



Plate count 



in second 



tube. 



I 

 4 

 4 

 42 

 46 

 4 

 7 

 5 

 2 



7 

 6 



Count per 

 liter. 



335 

 109 

 146 

 20 

 34 

 181 



103 

 51 

 161 

 180 

 109 



3^3 



277 



40 



32 



139 



Standard aeroscope. 



■D. ,.„ ^ I Plate count 



Plate count • , . 



. £ i ^ i_ m second 

 in first tube. ^.,„ 



131 



10 



118 



249 



3 

 26 



138 

 277 

 122 

 506 

 459 

 53 

 165 

 191 



175 



6 

 31 

 13 



33 

 19 

 12 



99 

 12 

 22 

 15 



29 



Count per 

 liter. 



82 

 6 



74 



156 



2 



16 



86 



173 

 76 

 316 

 287 

 33 

 103 

 119 



109 



CONNECTIONS SEALED WITH PARAFFIN. TRIPLICATE PLATING 



I 



2 



3 



4 



5 



6 



7 



8 



9 



10 



II 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



Average 



185 

 5" 

 382 

 500 

 382 

 128 

 179 

 185 

 185 

 391 

 436 

 364 

 854 

 813 

 , 050 

 ,281 

 248 

 225 

 338 

 273 

 204 

 136 

 322 

 224 

 217 



400 



0-5 



I- 5 



II. o 

 2. o 



•5 

 6.0 



6-5 

 o 

 2. o 



4-5 

 3-0 



I. o 

 4-7 

 1-3 

 9.0 



1-3 



1. o 



I- 7 

 4-3 

 3-0 

 1-7 



2. o 



3-0 

 1-3 



3-0 



116 

 319 

 239 

 3^3 

 239 

 80 

 112 

 116 

 116 

 244 

 273 

 228 



534 

 508 

 656 

 801 



155 

 141 

 211 

 171 

 128 



85 

 201 

 140 

 136 



2^:0 



116 

 582 

 378 

 485 

 394 

 164 



137 

 120 

 222 



437 

 328 



273 

 ,031 

 803 

 943 

 857 

 237 

 273 

 359 

 287 

 248 

 19s 

 391 

 143 

 218 



384. 



15 

 17 

 80 

 18 



25 

 22 



17 

 12 



75 

 24 

 39 

 32 

 90 



77 



131 



152 



7 



7 



52 



139 



42 



73 

 264 

 236 



303 

 246 



103 

 86 



75 

 139 

 273 

 205 

 171 

 644 

 502 

 589 

 536 

 148 

 171 

 224 

 179 

 155 



123 



244 

 89 



