avoid heating the thermometer by tlie pVesenee of liis own body. 

 (4) A thermometer must be given time to in(Mcate a new tcmpcraiiire." 



TEMPERATURES SHOULD BE PLOT'i'KI) 



To secure best results, orchardists and others usinj^ thermom- 

 eter readings should enter them on contour maps of their plant- 

 ings. One of the first things that will become apparent will be 

 tliat contours of elevation and lines of equal temperatures do not 

 always coincide. Higher ground does not always indicate a warmer 

 region, nor do lower levels correspond with decreased tempera- 

 tures. The drainage of the air, the drift of surface currents, the 

 orientation of the locality to the sun's rays, and the character of 

 the immediate environment, all contribute to the varying tempera- 

 tures encountered over a comparatively restricted locality. Temper- 

 ature controls can only be studied and definitely determined by the 

 use of accurate thermometers properly placed and carefully ob- 

 served. 



NEW BOTANICAL RECORDS FOR SOUTHERN 

 CALIFORNIA 



Anstruther Davidson, M. D. 



Lianthus filipes Benth. Gnaphalium heneolens Davidson; and 

 Boschniakia strobilacea Gray, the latter in great abundance under 

 the manzanita bushes, were collected by Mr. R. Kessler on Mt. 

 San Jacinto. 



Mr. L. Shick collected at Barton Flats, Psoralea rigida Pari-' - 

 hitherto only reported from San Diego County, and Anaphalis 

 margaritacea L. This is a rather unusual place to find the latter 

 as it is supposed to be an introduced species. Quercus Morehiis 

 Kell., a few trees of this species were discovered near Seven Oaks 

 by Mr. Joseph Anthony. 



27 



