Flora of Australia. 207* 



Tx„^„ Uiite of Growth 



"^^^- Corrected (lirtJi. per month of 3i> 



• ■ davH in 



Ft. in. ^i„. T^ >"• 



July 26. 1918 - - 6 8 12 - uil. 



August 16, 1918 - - «) 8 i:i . nil. 



September 21, 1918 - - 6 8 13 - nil 



October 10, 1918 - - 6 8 1-i - 



October 18, 1918 - - 6 8 li . 1.5 



October 30, 1918 - - 6 8 15 - 2.0 



November 7, 1918 - - 6 9 1 . 7.iV 



November 26, 1918 - - 6 9 5 - 0.3 



December 3, 1918 - - G 9 7 . 8.6 



December 14, 1918 - - 6 9 9 - 5.5 



December 26, 1918 - - 6 9 11 - 5.0 



January 17, 1919 - - 6 9 14 - 4.3 



January 30, 1919 - - 6 10 - 4.6 



February 20, 1919 - - 6 10 3 - 4.3. 



March 13, 1919 - - 6 10 5 - 2.9 



March 28, 1919 - - 6 10 5 - nil. 



April 25, 1919 - - 6 10 5 - nil. 



May 21, 1919 - - 6 10 5 - nil. 



August 1 1919 - - 6 10 5 - nil. 



Throughout the autumn and winter there was no evidence of any 

 expansion or contraction with changes of temperature within a 

 range of 45°F., (34:°F.-79°F.), the static measurement being 6 ft. 

 lO^f in. On several occasions after rain had fallen and saturated 

 the bark, corrected readings of 6.10 ii^were given (May 23rd, June 

 2nd, June 15th, June 30th, etc.), but between these times the mea- 

 surement reverted to 6 ft. 10 s \^ It would be of interest to* 



I ft 



know in detail the method of standardization adopted by Trow- 

 bridge and Weil, and" also what precautions were taken to dis- 

 tinguish between variations of girth due to moisture and those 

 supposed to be due to temperature. A variation of ^V ^"« ^'^ ^ *^- 

 lOy^ in. is approximately 0.07%, and if it were due to tempera- 

 ture, with a range of 45°F., it would represent 0.0017% per 1°F., 

 which would in any case be negligable in dealing with a material 

 like the trunk of tree. The view put forward by Trowbridge and 

 Weil that frost cracks are due to the pronounced contraction of the 

 diameter of the tree and not to the expansion of frozen water merits 

 further investigation. 



, -K/iT^^ Vkrbascum F>lattaria, L. Spurious or Twiggy Mullein. 



(Scrophulariaceae). 



In J. M. Black's Naturalised Flora of South Australia Ver- 



In J. M. Black's Naturalised Flora of South Australia, Ver- 



ralised aliens in South Australia, whereas in Victoria the only two 



