Bacterial Flora of the Semi -Desert Region of New Mexico. 229 



May 8: 



PL 1 — 6,042 bacteria. 



PI. 2 — 328 bacteria and 4 molds. 

 Species: A 1; A 2 , A 3 , A 4 , A 9 . 



The experiment shows that for this relatively high altitude 

 we still have a considerable number of bacteria. The effect 

 of the various factors incident to an extensive ranch should 

 not be overlooked here. Had the exposure been made some 

 distance out, the results would have been materially different. 

 Nevertheless, we see that bacteria can and do exist here. 



Exp. 28 — March 8, 1900. Hell Canon, 15 miles east of 

 Albuquerque in Sandia mountains. Three agar plates were 

 exposed by Pres. C. Herrick. No wind. 



PI. 1 — 6.30-8.00 P. M. 



PL 2 — 6.30 P. M.-6.00 A. M. 



PL 3 — 6.30 P. M.-6.00 A. M. 



March 16 — Pis. 2 and 3 show no growth, the medium hav- 

 ing been completely dried up, due to the dryness of the atmos- 

 phere. The plates had been placed in the moist chamber for 

 development with the hope of saving the work. 



PL 1 — 90 min. — 167 bacteria and 8 molds. 

 Average per 10 min., 18.5 bacteria. 

 Species: A t , A 2 , A3, A 4 , A 9 , and Ai . 



The above experiments (24-28) would indicate that the 

 bacterial flora in other parts considerably removed, is very 

 similar to that about Albuquerque. The greatest difference 

 is found in percentages of the species. A given species that 

 is abundant in one place may be rare in another, while the 

 reverse may be true of other species. 



The exposure in Hell Canon shows rather a larger number 

 of bacteria for an uninhabited mountainous district than 

 might have been expected. 



Experiments with Reference to Altitude. 



In order to make a special test of altitude in this connec- 

 tion, several experiments were made at Camp Whitcomb, 

 which is located in Tijeras canon, 18 miles east of Albu- 

 querque, and at a height of nearly 7,000 ft. 



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