72 



BOTANICAL GAZETTE 



I JANUARY 



compilation. In this way credit due other investigators appears to belong 

 to Ewart, and no one has suffered more in this respect than the writer.- 

 William Crocker, The University of Chicago. 



RESPIRATION CALORIMETER 



W 



plant physiology 



copy of which has come into my hands through his courtesy, I am inter- 

 ested to find a Dewar flask figured as a respiration calorimeter. Before 

 my recent paper was published (Bot. Gazette 46:193-202. 1908), I 

 wrote to Mr. Ganong, knowing that he was preparing a second edition of 

 his book, asking him to put my calorimeter into it. He wrote that his 

 book had already gone to press. When my paper appeared he wrote 

 again, saying that he "had been using the Dewar bulbs as a respiration 



calorimeter some four years past Of course the point about the 



prior use of the bulbs is of no consequence whatever, and I mention it 



now because of the coincidence in your asking me to mention their use in 

 my book." 



To acknowledge this, and to record another of the curious coincidences 

 which after all are not altogether rare in the history of science, is the pur- 



pose of this note. 



J. Peirce, Leland Stanford 



CRATAEGUS IN COLORADO 



writer 



a misstatement in an article in this journal for November, 1908. On p. 

 382, line 4, I should have said that the species described resembles most 

 C. erythropoda, of the forms known to the writer in northern Colorado - 

 Francis Ramaley, Boulder, Colorado. 



