Bacterial Flora of the Semi -Desert Region of New Mexico. 215 



October 12. — Colonies were counted as follows : 



PL 2 min. — 18 bacteria (2 spp.) and 3 molds. 



PI. 4 min. — 47 bacteria (4 spp.) and 1 mold. 



PI. 6 min. — 61 bacteria (5 spp.) and o mold. 



Average per 10 min., 102.7 bacteria. 

 The species were A], A 2 , A 5 , A 8 , and A 9 . 



Exp. 3. — October 13, 1898, 9.30 a. m. Three gelatin plates 

 were exposed 300 feet east of University building for 2, 4, 

 and 6 minutes respectively. 



Conditions: Stiff breeze from east, i. e., from the moun- 

 tains over the " Mesa ;" dry. 



October 24 : 



PI. 2 min. — o bacteria and 2 molds. 



PL 4 min. — 13 bacteria and 3 molds. 



PL 6 min. — ? bacteria and 8 molds. 



Average per 10 min. (PL 4 min.) 32 bacteria. 

 This last plate was covered by molds, so that the colonies 

 could not be counted with any degree of certainty. 



The colonies of each species on PL 4 min. were counted 

 with the following result : 



A,. — 3 colonies: 23.6 per cent. 



A 2 . — 2 colonies : 15.4 per cent. 



A 3 . — 4 colonies: 30.8 per cent. 



A 9 . — 4 colonies : 30.8 per cent. 



Exp. 4. — October 17, 1898, 4.00 p. m. Three agar plates 

 were exposed northeast of main building for 2, 4, and 6 

 minutes respectively. 



Conditions: Clear with slight breeze. 



October 25 : 



PL 2 min — 3 bacteria (2 spp.) and 3 molds. Spp.: A,, 2 

 colonies ; A 2 , 1 colony. 



PL 4 min. — 44 bacteria (4 spp.) and 1 mold. Spp.: A,, 22 

 colonies; A 2 , 5 colonies ; A 3 , 2 colonies; A 9 . 15 colonies. 



PL 6 min. — 62 bacteria (4 spp.) and 1 mold. Spp.: Ai, 18 

 colonies; A 2 , 6 colonies; A 3 , 3 colonies; A 9 , 35 colonies. 

 Average per 10 min., 36.1 bacteria. A 3 is a milky white 

 colony, while A 9 is ashy-grey in color. 



October 28. — A colony of red yeast was also found. 



5 



