188 



NOTES AND COMMENT 



from inhaling unduly large amounts of the ozone of scientific inspiration 

 and health. Has the suppression of individual opinion in the scientific 

 bureaus resulted from an inferior quality of opinions, offered by men 

 of incomplete training, or has the suppression itself kept out of the 

 rank and file of the government service the men whose opinions are 

 sound? 



Through a delay in the mails the following paragraph was omitted 

 from the end of Mr. Charles S. Ridgway's article, Callo.se in Root- 

 Hairs, in the April issue of The Plant World: 



Since the above went to press callosed root-hairs have been found on 

 corn roots produced entirely in a moist atmosphere, and also on those 

 growing in pure crushed quartz moistened with distilled water. It 

 seems, therefore, that the formation of callos^ is due to intracellular 

 enzymatic action in root-hairs as well as in sieve tubes, as suggested bj' 

 Hill and by Sykes, in Annals of Botany, vol. 22, 1908. However, no 

 conclusive evidence has been found, as yet, which throws sufficient 

 light on the physiological significance of callosed root-hairs to warrant 

 conclusions. 



